Is the Sipeed NanoKVM Safe? On-board Microphone Identified

The Sipeed NanoKVM Cube is a low cost, network connected KVM built around the LicheeRV Nano RISC-V module, and recent reporting has drawn attention to the fact that this first generation hardware quietly inherited an onboard analog microphone from that core board. While the LicheeRV Nano documentation clearly lists audio input and output capabilities, the NanoKVM product materials initially focused on its KVM role and did not prominently call out the presence of a microphone on the internal PCB. That gap in presentation, combined with the device’s origin in China and its role as an always-on, remotely accessible appliance, has led to questions about transparency and potential privacy impact. This article reviews what is actually on the hardware, how Sipeed has responded, which issues have been addressed in software, and what residual risk remains for users who already have the NanoKVM Cube deployed.

The NanoKVM Cube and That Microphone – What We Learned?

The initial detailed public discussion of the NanoKVM Cube microphone came from a Telefoncek.si research article, which documented security testing of early units and highlighted the presence of a small, operational microphone on the device’s PCB. The NanoKVM Cube is built on the LicheeRV Nano platform, and that design decision is the origin of the audio hardware. The LicheeRV Nano specification explicitly lists an onboard analog silicon microphone for audio input and a PA amplifier for driving a small speaker, because the module is intended as a general purpose SBC for a range of embedded applications. When Sipeed used this module as the core of a consumer facing KVM, the Cube inherited that audio circuitry intact, including the tiny surface mount MEMS microphone, even though typical KVM usage does not require audio capture capabilities.

What Telefoncek.si article from Feb ’25  drew attention to was the combination of this hardware and a software stack that already contained working audio tooling. Researchers who obtained early NanoKVM units found that, with SSH access, standard ALSA tools such as amixer and arecord could be used to adjust gain and record ambient sound through the built in microphone, and that the resulting audio files could be copied or potentially streamed off the device. At that time, the NanoKVM product page described its relationship to the LicheeRV Nano SDK and resources in general terms, but did not highlight that a functioning microphone remained present on the KVM board. For many users, that gap between what the SBC documentation said and what the KVM product page emphasized was perceived as a lack of clear disclosure rather than a predictable consequence of module reuse.

The NanoKVM Security Concern and Presentation Issues

The initial concern around NanoKVM security was not limited to the microphone. Early firmware builds shipped with default credentials, SSH enabled, weak web security controls, and hardcoded encryption keys that were identical across devices. Researchers also found diagnostic and security utilities present on the system image that were more appropriate for development or lab use than for a small appliance likely to be exposed on home or small business networks. These findings created a picture of a product that had been moved from prototype to retail relatively quickly, with baseline functionality in place but limited attention paid to hardening or least privilege.

Presentation played a significant role in how the microphone issue was perceived. For the LicheeRV Nano SBC, the presence of audio input and output is clearly listed as part of the hardware specification, and that makes sense for a general purpose module. For NanoKVM Cube, the public facing documentation initially focused on KVM features, HDMI input, and compatibility with the LicheeRV Nano SDK, while leaving the inherited audio hardware implicit. Only later did the NanoKVM wiki entry gain explicit wording that the Cube retains display, touch, microphone, and amplifier circuits from the base module, and that newer firmware versions would remove the relevant drivers and future production runs would omit these components entirely.

Sipeed’s public responses combine these two aspects. On the one hand they point to the LicheeRV Nano documentation and the updated NanoKVM wiki as evidence that the microphone is not intended to be secret. On the other hand they argue that, from a threat model perspective, the presence of a board level microphone does not materially change risk once an attacker has obtained full control of the device, since they could already perform sensitive actions through the host system. For critics, the issue is less about the technical possibility of audio capture in a fully compromised scenario and more about expectation and trust: a network attached KVM marketed primarily on its remote control capabilities but not clearly calling out built in audio capture hardware is likely to be treated with more suspicion, especially when it comes from a vendor that has already needed several rounds of security fixes.

Reality Check – How Much of a Concern is this?

From a strict security engineering viewpoint, the onboard microphone in the NanoKVM Cube does not create a new, independent way into the device. An attacker still needs a working exploit, exposed service, or misconfiguration to gain sufficient access before any audio capture is possible. In that sense, the primary risk is still the usual set of issues that apply to any IP KVM: exposed management interfaces, weak credentials, unpatched firmware, or poor network segmentation. If those fundamentals are handled correctly, the probability that a remote attacker can turn the Cube into a listening device is significantly reduced, and using alternative firmware or a locked down software stack can further narrow the options.

The impact side of the equation is different. Once a NanoKVM Cube is compromised at a system level, the presence of a functional microphone increases the potential harm compared with a KVM that only relays keyboard, video, and mouse. A device that sits in a home office, lab, or equipment room and can capture ambient sound can turn a general compromise into a privacy incident that extends beyond the connected host system. For some users that incremental risk will be acceptable if the device is strictly isolated, regularly updated, and treated as an untrusted appliance at the edge of the network. For others, the residual possibility of room audio capture from a small, unattended box may be enough to justify either physical removal of the mic, replacement with a later hardware revision, or avoiding this particular model altogether.

Note. Here is the board view of the NanoKVM USB and NanaKVM Pro PCIe, with no microphone visible:

Asking Sipeed Questions about the NanoKVM Microphone Issue – How and Why This Occurred?

To clarify how the microphone ended up in a shipping KVM product and what Sipeed intends to do about it, I put a series of written questions to the company. The goal was not to reassess the technical findings already covered by independent research, but to obtain clear statements from the vendor on 4 points: how they view the documentation and disclosure around the microphone, which specific NanoKVM variants and hardware revisions include it, what mitigations they believe limit its security and privacy impact for existing deployments, and what concrete changes they are planning for future production runs. The questions and Sipeed’s responses are reproduced in full below. Thanks again to Caesar Wu for his time in answering my questions.

Why was there a microphone on the device, and how/why it’s absent from the documentation?

This premise contains a serious factual error made by the original article. The presence and rationale for the microphone are not undocumented; they are explicitly mentioned on the product’s main Wiki page: https://wiki.sipeed.com/hardware/en/kvm/NanoKVM/introduction.html#NanoKVM

Which Version/Batch/Revisions of NanoKVM feature this Microphone?

The microphone is featured on the NanoKVM Lite and NanoKVM Cube versions. These are derivative products based on the LicheeRV-Nano (RISC-V SBC core module) and consequently inherited its Single Board Computer (SBC) peripherals, including the microphone, speaker, and MIPI touchscreen support.

Is this present on other versions of NanoKVM (i.e PCIe, Pro, USB, etc)?

No. Other products use custom-designed boards dedicated solely to the KVM scenario. They do not reuse the SBC module and therefore do not include non-KVM-essential components.

Why was this microphone not eliminated at the point of production?

The core part of NanoKVM-Cube/Lite is LicheeRV Nano. We reuse LicheeRV Nano as a standard “SOM” in many different products, like AI Camera MaixCAM:    https://www.aliexpress.com/item/1005006912917562.html . And our toB customer also use it as a standard linux core board(Just like RPi CM4, CM5), they are very satisfied with the onboard microphone, speaker, and touch screen.  As stated in my previous email, we maintain that logically, the retention of the microphone on the board does not introduce any negative impact on security. While the onboard components (microphone, speaker power amplifier (PA), and touchscreen connector) introduce a slight increase in Bill of Materials (BoM) cost, this decision significantly simplifies inventory management.

In fact, the base LicheeRV Nano product already comes in 4 configuration variants (Basic, Eth, WiFi, and Ethe+WiFi).  If we were to further segment the inventory by adding options for the presence or absence of the microphone and touchscreen connector, the total number of SKUs  would increase exponentially(the number of SKUs multiplies by two for every added configuration options). Therefore, based on a comprehensive consideration of security, cost efficiency, and inventory management complexity, we maintain the microphone, speaker PA, and touchscreen connector as the default base configuration.

What steps are being taken to ensure that this does not pose a Security/Privacy threat to user who have the nanoKVM in active deployment?

Users must understand the threat model: an attacker can only listen via the onboard mic if the NanoKVM itself has already been fully compromised. The paradox is that once compromised, the attacker already has sufficient privileges to perform high-level operations (include record audio via PC’s own mic). Therefore, the presence of the onboard mic does not increase the inherent security risk of the device. We emphasize that proper network risk awareness and isolation configuration by the user are essential, regardless of whether the device is a NanoKVM, JetKVM, GL.iNet KVM, or PiKVM.

What further steps have been made/planned at Production to avoid this occurring again in future hardware releases?

As stated in Question 4, we plan to remove the microphone in the next batch of the Lite/Cube models purely for psychological comfort and ease of mind for our users. We acknowledge this step will inevitably increase our inventory management complexity due to the need for separate SKUs and production processes. We are also implementing more rigorous hardware audits to ensure compliance with the Principle of Least Privilege in future designs.

Conclusion – Should NanoKVM Owners Be Worried?

For current NanoKVM Cube owners, the level of concern depends largely on how and where the device is deployed. In a well segmented environment where the KVM sits on an isolated management network, with updated firmware and strong access controls, the presence of a dormant microphone on the board is a secondary issue behind the more general risk of any remote management appliance. In small or less structured setups where the NanoKVM has direct exposure to the internet or shares a LAN with everyday client devices, both the historical software weaknesses and the possibility of audio capture in a successful compromise are more relevant factors in deciding whether to keep using the unit unchanged.

Looking ahead, Sipeed has stated that newer firmware removes the audio drivers and that future Lite and Cube batches will omit the microphone and related circuitry entirely, which addresses the concern for new buyers over time. For existing devices, users who are uncomfortable with any residual audio capability have practical options: physically removing or disabling the mic at board level, reflashing with a minimal or community maintained software stack, or replacing the hardware with a later revision or a different KVM platform. The key is to treat the NanoKVM Cube as a high impact management tool rather than a neutral accessory, and to decide whether its cost and feature set justify the additional precautions it requires in a given environment.

 

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Sipeed NanoKVM Pro KVM Review

The NanoKVM Pro from Sipeed represents the latest iteration in the company’s growing range of remote management devices, developed as a more capable successor to the original NanoKVM. Building on the lessons learned from its earlier RISC-V model, this version introduces a dual-core ARM architecture and significantly enhanced system resources. The design focus shifts toward higher-resolution capture, faster data handling, and improved remote-access functionality, all within a self-contained form factor that can sit on a desk or integrate into rack systems. Supported by an open-source PiKVM-based software environment, it provides the same level of control normally associated with enterprise IPMI solutions, including BIOS access, remote mounting of ISOs, and full keyboard-video-mouse interaction through a browser interface. Unlike many entry-level devices in its category, it supports 4K capture up to 30 fps, 1080p up to 60 fps, and HDMI loop-out for simultaneous local display. Optional features such as Wi-Fi 6, PoE input, and ATX power control expand its deployment flexibility across both professional and hobbyist environments. With 1 GB of LPDDR4X memory, 32 GB of onboard eMMC storage, and the ability to run either NanoKVM OS or full PiKVM firmware, the Pro model aims to balance affordability with advanced functionality suited to modern remote administration setups. But is it any good? Let’s find out if the NanoKVM Pro deserves your money and your data.

*UPDATE 9/12/25* The original NanoKVM (so, not the device in this video/article, but the first development version) features a small on board microphone that can be activated over SSH. This *looks* like it was a case of the brand reusing an existing board and it having the mic onboard (the LicheeRV Nano – which DID mention the microphone in it’s hardware specifications, but it is not detailed on the NanoKVM spec sheets at the time of discovery). I am currently going over the NanoKVM Pro device in this video for any further issues of hardware irregularities or issues discovered since this video was published (the device has been in action for 3 weeks more now), but even early checking has shown up negative/nothing. Bottom line, that device was not released finished, and early reviews of that device absolutely SLAMMED it for security issues (again, see Aparld’s vid linked in the description!) largely related to poor practices (plain text passwords, chinese DNS, etc), so no one should be deploying it on mission-critical clients anyway. Nevertheless, this sounds like (at best) a stupid mistake by the brand, and (at worst) poorly developed and badly baked hardware. I have reached out to the brand for more on this and will add here as/when it arrives. In the meantime, check out Jeff’s Level 2 channel for his video on this, which does a solid job of nailing the salient points! You can find the original investigation of the device HERE .

NanoKVM Pro KVM Review – Quick Conclusion

The NanoKVM Pro from Sipeed is a compact, Linux-based IP-KVM device that brings enterprise-grade remote management features into an affordable, open-source package designed for homelab enthusiasts, technicians, and small-scale administrators. Built around a dual-core ARM Cortex-A53 processor with 1 GB of LPDDR4X memory and 32 GB of onboard eMMC storage, it supports 4K capture at 30 fps, 1080p at 60 fps, and HDMI loop-through for simultaneous local display, while maintaining low latency and stable frame delivery over gigabit Ethernet or Wi-Fi 6. The device integrates ATX control for power and reset functionality, allowing full BIOS-level access and system reboots without physical interaction, and can be powered via USB-C, PoE, or motherboard header connection. A 1.47-inch touchscreen with rotary encoder provides local control and monitoring, supported by an intuitive browser-based interface that enables ISO mounting, firmware updates, and encrypted remote access through built-in Tailscale VPN integration. It runs either Sipeed’s NanoKVM firmware or a full PiKVM stack, both of which are open-source and compatible with community-developed extensions, including AI-assisted features that perform local OCR and screen automation. The aluminum body ensures passive cooling and silent operation, with power draw averaging 3 to 7 watts depending on load. While early firmware builds lacked full 4K45 and H.265 support, continued updates have addressed most of these gaps, and the open nature of the platform allows for further improvement. Its minor drawbacks—such as inconsistent cable bundles, a lightweight dial, and limited CPU overhead during heavy 4K sessions—are outweighed by its flexibility, performance, and independence from proprietary cloud control. Overall, the NanoKVM Pro stands out as one of the most capable and customizable IP-KVM solutions in its price range, offering real out-of-band management power in a device smaller than a deck of cards.

Sipeed NanoKVM Pro on AliExpress	Sipeed NanoKVM Pro on Amazon

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NanoKVM Pro KVM Review – Design & Storage

The NanoKVM Pro adopts a compact aluminum enclosure that measures 65 by 65 by 28 millimeters, emphasizing passive cooling and durability over aesthetic design. The casing doubles as a heat spreader, transferring thermal load from the PCB through its metal base and dissipating it through the chassis surface. This construction allows it to maintain stable temperatures around 50–55°C during typical use, even with extended operation or PoE power input. The metal build makes it suitable for permanent desktop placement or rack integration, and Sipeed provides 3D printable mounting templates for both single and triple-unit configurations. Despite its small footprint, the front panel includes a 1.47-inch 320×172 capacitive touch display and a rotary encoder that enables system navigation and control without needing to connect a keyboard or mouse. The LCD serves both as a configuration interface and as a secondary monitoring screen, capable of displaying live HDMI capture, resource utilization, or user-defined Python applications.

Storage performance represents a notable improvement over the earlier NanoKVM, which relied on a microSD card for its operating system. The Pro integrates 32 GB of eMMC storage rated at approximately 300 MB/s read speeds, providing faster ISO mounting and firmware updates, as well as the ability to host lightweight scripts or utilities locally. The onboard storage can be expanded through a microSD slot positioned beside the HDMI input, supporting additional media up to 512 GB. This expansion capability allows users to keep multiple boot images or installation media accessible directly through the web interface, making it useful for managing test systems or recovery environments. In practice, transferring a 1 GB ISO via a gigabit network takes about a minute, which is considerably faster than previous microSD-based units.

Externally, the NanoKVM Pro’s layout balances density and accessibility. All primary I/O connections, including HDMI input and output, dual USB-C ports for power and HID control, and a gigabit Ethernet port, are aligned along the rear edge to simplify cable routing in both rack and desktop configurations. The USB-C design allows for flexible power sourcing, supporting either direct 5V input, PoE via Ethernet, or ATX line integration through the bundled adapter board. This modularity is complemented by a detachable ATX control board that connects through a flat ribbon cable, enabling power, reset, and LED signal passthrough from a host motherboard. When connected correctly, this board allows remote hard resets and complete power cycling through the web interface, replicating the hardware-level management seen in dedicated IPMI modules.

On the front of the device, the rotary dial and touchscreen offer combined tactile and touch control options. Short presses, rotations, and swipes allow for full system interaction, while long presses bring up system menus and app selections. The screen can also operate as a secondary display via USB connection on Windows systems, acting as a miniature monitor that mirrors or supplements the primary display output. Through custom scripts, users can configure the display to show diagnostic data, resource graphs, or network metrics, further extending the device’s use beyond remote management.

Sipeed’s packaging reflects the device’s development-oriented nature. The kit typically includes two USB-C to USB-A cables, a short HDMI cable, and an ATX interface adapter with DIP cables, although early Kickstarter units reportedly shipped with incomplete cable sets. Documentation is provided through QR-linked web guides rather than printed manuals, directing users to detailed online setup instructions and firmware repositories. This approach aligns with Sipeed’s community-driven model, where updates, firmware images, and user scripts are hosted on GitHub for open access.

Finally, the overall footprint and passive cooling design allow the NanoKVM Pro to run silently, drawing between 3 to 5 watts depending on load, or up to 7 watts when AI functions or ambient lighting are enabled. While compact enough for portable or field use, it performs best when placed on conductive or ventilated surfaces, such as a metal case or rack shelf. The Pro model’s focus on internal storage, heat management, and flexible installation makes it notably more practical than most low-cost USB KVMs and positions it closer to a self-contained remote administration terminal.

NanoKVM Pro KVM Review – Ports and Connectivity

The NanoKVM Pro provides several configuration options for both local and remote access, reflecting its design for flexible integration across various network types. Wired connectivity is managed through a full gigabit Ethernet interface, which supports both data transfer and Power over Ethernet (PoE) in certain configurations. This upgrade from the previous model’s 100 Mbps port reduces latency and ensures smoother 4K capture and ISO mounting operations across a local area network.

For environments where wired access is unavailable, Sipeed also offers Wi-Fi 6 variants that include built-in wireless support, allowing users to connect through a temporary access point and configure the device from a phone or laptop. Initial setup is handled through DHCP, displaying the assigned IP address directly on the front LCD screen. From there, users can access the web interface by entering the device’s IP address in a browser such as Chrome, with HTTPS enabled by default through a self-signed certificate.

For secure remote administration, the NanoKVM Pro includes native support for Tailscale, enabling encrypted VPN-style access across different networks without manual port forwarding. Once linked to a Tailscale account, the unit automatically joins the same virtual LAN as other connected devices, simplifying access to systems behind firewalls or NAT routers. This makes it suitable for home users who need unattended access to remote PCs or small business administrators managing distributed systems.

The device also supports USB-NCM network connections for direct link setups, as well as traditional SSH sessions for users who prefer command-line management. Because the underlying operating system is based on Ubuntu, it can also host additional networking utilities such as ZeroTier or Cloudflare Tunnels, giving users a range of choices for secure remote links depending on their existing infrastructure.

The NanoKVM Pro also supports HDMI loop-through, allowing users to connect both the target computer and a local display simultaneously. The input captures up to 4K at 30 frames per second, while the output can pass through up to 4K at 60 frames per second, depending on the connected monitor and signal mode. This dual-mode setup enables simultaneous viewing and control without interrupting the host system’s display, which is particularly useful for remote diagnostics or shared monitoring environments. In practice, the captured video stream can be viewed in near real time, with local testing showing roughly three frames of latency difference on a gigabit network connection. Combined with audio capture and bidirectional USB-HID control, the NanoKVM Pro provides a complete interface for headless or offsite system management.

NanoKVM Pro KVM Review – Internal Hardware

Internally, the NanoKVM Pro is based on the AX630C processor, a dual-core ARM Cortex-A53 SoC operating at 1.2 GHz. This represents a significant step up from the previous NanoKVM’s single-core RISC-V SG2002 processor, which struggled with multitasking and heavier video capture workloads. The new chip enables both 4K video input and real-time encoding in H.264 or H.265, as well as MJPEG for lower-latency streaming. It is paired with 1 GB of LPDDR4X memory and 32 GB of onboard eMMC storage, providing a notable improvement in performance and responsiveness when handling ISO uploads, live video feeds, or concurrent network sessions. In operation, CPU utilization typically sits around 25 to 35 percent during local access, rising to 50 to 60 percent when performing 4K capture or running AI-assisted functions.

Thermal management relies entirely on the metal enclosure acting as a passive heatsink. The system consumes roughly 3 to 4 watts at idle and up to 7 watts when AI processing or 4K capture is active. During extended use, surface temperatures can reach the mid-50 °C range, while internal readings may approach 70 °C under continuous workloads. Despite this, thermal throttling has not been observed in regular use, provided the device is placed on a conductive or ventilated surface. Users operating in warmer environments can improve dissipation by resting it on a metallic case or rack shelf, as the aluminum body is designed to transfer heat evenly across its underside. The device remains silent throughout, as no active fan is used.

Internally accessible interfaces add to its adaptability. Two USB-C ports handle power and human interface device connections, while a microSD slot offers external storage expansion or alternate firmware booting. A small 0.1 mm header provides access to two RS-232 serial ports, allowing direct console communication with servers, switches, or other serial-based equipment. This makes the NanoKVM Pro suitable not only for managing desktop systems but also for integrating with embedded or industrial hardware that lacks graphical interfaces.

Combined with the ATX breakout board for power management and the option to use the unit’s LCD as a miniature USB secondary display, these features extend its application well beyond that of a standard KVM switch.

NanoKVM Pro KVM Review – Software and Services

The NanoKVM Pro runs on a customized Linux environment built around the open-source PiKVM framework, allowing users to operate within Sipeed’s own NanoKVM interface or switch to a full PiKVM installation through the system menu. The preinstalled NanoKVM environment provides a more streamlined interface tailored to less experienced users, offering web-based management with HTTPS, user authentication, and direct BIOS-level control of connected systems. It supports remote mounting of ISO images, firmware updates, and automated scripts, all handled through an integrated file manager accessible via browser. The software operates entirely locally by default, without mandatory cloud connections, which is a notable distinction compared with many modern remote-access appliances that rely on vendor relay servers.

Once configured, users can log in through a web browser using the device’s IP address, with the default credentials set to “admin” for both username and password. The interface prompts password change on first login and provides granular control over network settings, storage, user accounts, and ATX power functions. Most settings can be modified directly through the web GUI without command-line access, although advanced users can enable SSH for deeper configuration or script automation. Firmware updates are managed via the same interface, with an option to enable preview builds for early access to experimental features such as H.265 encoding or AI integrations. The NanoKVM Pro also includes support for WebSSH, allowing browser-based terminal access to the device itself or to the connected host.

One of the most distinctive aspects of the NanoKVM Pro is its front-panel software ecosystem. The 1.47-inch touchscreen runs its own UI layer with interactive menus, swipes, and rotary input for navigation. It displays real-time system metrics such as CPU load, IP address, and network status, and can also serve as a live HDMI preview display. Beyond these default utilities, users can install small Python-based applications that render custom data on the screen. Three example apps—“coin,” “conway,” and “hello”—are included to demonstrate this feature, and advanced users can upload their own code to the /userapp directory to display statistics, weather, or system messages. Through this approach, the NanoKVM Pro acts not just as a control interface but as a miniature programmable display for local or rack-mounted setups.

Remote management services are another major focus. Tailscale is preinstalled, providing quick setup for secure, encrypted remote sessions without the need for static IP addresses or manual port forwarding. For users preferring other approaches, the device’s Ubuntu base supports additional VPN tools such as ZeroTier, WireGuard, or Cloudflare Tunnels, which can be manually installed through apt. This flexibility ensures compatibility with existing enterprise or homelab networks. The system also includes Wake-on-LAN, remote reboot, and full ATX control options, allowing users to perform power cycling or forced shutdowns directly through the web interface. The integration of these features means the NanoKVM Pro functions as an accessible alternative to server-grade remote management tools, at a fraction of their cost and complexity.

Finally, Sipeed has begun introducing experimental AI-driven functions in its firmware. These include smart assistant options that use basic optical character recognition (OCR) and contextual automation to simplify KVM operations such as copying text from the remote screen or assisting with troubleshooting prompts. Although early and limited in scope, the AI feature demonstrates the company’s effort to integrate local intelligence without relying on external cloud processing. This is complemented by the open-source nature of the platform, where both NanoKVM and PiKVM firmware images are publicly available for inspection and customization. Users can adapt the system to their own needs, extending its functionality through community scripts or integrating it into larger automation frameworks for testing, monitoring, or remote maintenance tasks.

NanoKVM Pro KVM Review – Verdict and Conclusion

The NanoKVM Pro marks a substantial improvement over its predecessor, combining more capable ARM hardware with higher capture quality, local storage, and multiple remote-access options. It bridges the gap between budget IP-KVMs and more professional management tools, delivering features like ATX control, HDMI loop-out, Tailscale connectivity, and a programmable touchscreen interface within a single, compact unit. The open-source base allows users to adapt it for highly specific workflows, whether for homelab management, small business system maintenance, or integration into test benches and automation setups. In day-to-day operation, latency and video performance remain strong over gigabit connections, with the interface proving responsive and stable. While early firmware versions lacked some advertised features such as full 4K45 capture and H.265 encoding, updates have continued to expand the system’s capabilities over time.

As a whole, the NanoKVM Pro is best understood as an evolving platform rather than a fixed appliance. Its combination of hardware versatility and accessible software design positions it as one of the more flexible low-cost KVM options available, even if certain elements, such as the dial build quality and early AI features, feel unfinished. For users seeking an independent, locally managed solution for BIOS-level control and remote diagnostics without vendor lock-in, it represents one of the strongest value offerings in its class.

Sipeed NanoKVM Pro on AliExpress	Sipeed NanoKVM Pro on Amazon

Sipeed NanoKVM Pro PROs

Sipeed NanoKVM Pro CONs

Dual-core ARM processor provides smooth 4K capture and significantly faster response than the original NanoKVM Integrated 32 GB eMMC storage allows quick ISO mounting and firmware management without reliance on microSD cards Full 1 Gbps Ethernet with optional PoE and Wi-Fi 6 ensures versatile network deployment HDMI loop-through supports local display alongside remote viewing up to 4K at 30 fps Built-in ATX power control enables full remote power-on, reset, and shutdown of connected systems 1.47-inch touchscreen and rotary encoder provide direct local control and real-time status display Open-source Linux base (NanoKVM and PiKVM compatible) allows community firmware and user-script customization Preinstalled Tailscale client offers secure remote access without port forwarding or cloud dependency Passive metal enclosure ensures silent operation and effective heat dissipation in 24/7 use

The front control dial feels fragile and lacks precision during use AI assistant and H.265 video support remain experimental or incomplete in current firmware Some units ship with missing or inconsistent cable sets depending on the retail batch Limited performance headroom during sustained 4K capture or concurrent remote sessions

 

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Finally, for free advice about your setup, just leave a message in the comments below here at NASCompares.com and we will get back to you. Need Help? Where possible (and where appropriate) please provide as much information about your requirements, as then I can arrange the best answer and solution to your needs. Do not worry about your e-mail address being required, it will NOT be used in a mailing list and will NOT be used in any way other than to respond to your enquiry. [contact-form-7] TRY CHAT Terms and Conditions   Alternatively, why not ask me on the ASK NASCompares forum, by clicking the button below. This is a community hub that serves as a place that I can answer your question, chew the fat, share new release information and even get corrections posted. I will always get around to answering ALL queries, but as a one-man operation, I cannot promise speed! So by sharing your query in the ASK NASCompares section below, you can get a better range of solutions and suggestions, alongside my own.

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GL.iNet Comet Pro Review

The GL.iNet Comet Pro is the company’s latest remote KVM (Keyboard, Video, Mouse) solution, launched on Kickstarter with shipping scheduled for December 2025. Unlike standard remote desktop tools that require a functioning operating system, a KVM device operates at a much lower level, providing access from cold boot and BIOS onward. This allows users to troubleshoot, install operating systems, and manage systems without direct physical interaction. Positioned as both an upgrade to GL.iNet’s original Comet KVM and as a potential rival to the JetKVM, which attracted considerable attention in 2024, the Comet Pro integrates more modern hardware and a larger feature set. The device includes a quad-core ARM Cortex-A53 processor, 1GB of DDR3 memory, 32GB of onboard eMMC storage, and a 2.22-inch touchscreen for configuration. Alongside HDMI passthrough supporting up to 4K at 30 FPS, it also incorporates Wi-Fi 6 connectivity, Gigabit Ethernet, and a range of accessory integrations such as an ATX power board and Fingerbot for remote power cycling. Early backers can pledge from $99, with campaign tiers running up to $155 depending on bundles, and at the time of writing, the campaign has surpassed £200,000 in pledges with more than 1,900 supporters.

GL.iNet Comet Pro Review – Quick Conclusion

The Comet Pro is a compact KVM device that builds on the foundations of earlier solutions with stronger hardware, built-in storage, dual HDMI with passthrough, and both wired and Wi-Fi 6 connectivity, making it practical for local and remote management tasks. Its touchscreen interface, bundled cables, and accessory support via the ATX board and Fingerbot give it utility beyond basic KVM duties, while low power draw and stable thermals make it suitable for 24/7 use. However, its design also brings limitations, most notably the fixed 32GB eMMC storage with no expansion, the absence of PoE for simplified cabling, and just 1GB of RAM, which may restrict headroom for heavier workloads. Compared with the JetKVM, the Comet Pro is more expensive but offers significantly higher specifications, a more polished and consumer-ready experience, and wireless deployment options, whereas JetKVM appeals to those who prioritise affordability, open-source flexibility, and community-driven extensions. Ultimately, the Comet Pro is best suited for users seeking a stable, ready-to-use appliance, while JetKVM remains the choice for enthusiasts who prefer a leaner, hackable platform.

Important! This is not ‘traditional retail’, this is Crowdfunding!

It is important to note that the Comet Pro is currently a crowdfunding product and not a retail release. Backing through Kickstarter carries inherent risks, as funding a campaign does not guarantee delivery, nor does it ensure the final product will exactly match the early prototypes or promises made during the campaign. GL.iNet has a history of successfully shipping crowdfunded devices, but manufacturing delays, component shortages, or design changes can still occur. Potential backers should approach pledging with awareness of these risks and only commit funds they are comfortable waiting on until the estimated December 2025 shipping window, bearing in mind that schedules may shift.

GL.iNet Comet Pro Review – Design

The Comet Pro adopts a compact desktop form factor measuring 93 × 84 × 47 mm and weighing just 170 g, making it small enough to sit discreetly on a desk or beside a server rack without occupying unnecessary space. Despite this minimal footprint, it integrates a 2.22-inch colour touchscreen on the front panel, which plays an important role in the day-to-day use of the device. This screen is not only employed during initial setup for Wi-Fi and PIN entry but also allows the user to directly toggle remote services on or off, adjust brightness, and check status information such as uptime or network configuration.

Unlike entry-level KVMs that demand all management through a browser, the inclusion of a touchscreen brings a more immediate, appliance-like feel to the unit. Heat management has also been considered, with the case designed with discreet venting along the underside to maintain airflow during continuous operation. In extended sessions, surface temperatures were recorded at up to 49°C at the base, but without throttling or stability issues, showing the design can sustain 24/7 deployment.

Visually, the device takes a utilitarian approach, using a clean matte finish and prioritising ease of connection rather than elaborate styling. One of the more practical design decisions is the use of full-sized HDMI input and output ports. Many compact alternatives rely on mini HDMI or adapter cables, which can create points of failure or add cost, whereas the Comet Pro provides standard connections that integrate directly with PCs, NAS units, or workstations.

The rear panel arranges all I/O in a straightforward, linear layout, including Ethernet, USB power, USB-A for accessories, and the dual HDMI ports, reducing clutter and keeping cable routing manageable. This makes the device particularly well suited for semi-permanent setups where it may sit behind a desk or alongside other networking gear. GL.iNet has also bundled a complete set of cables in the package, including HDMI, USB-C to USB-C, USB-C to USB-A, and Ethernet, ensuring the unit can be deployed without requiring third-party accessories.

Build quality and practicality are at the centre of the Comet Pro’s design choices. At under 200 g, it is easy to reposition, mount, or carry between locations, yet solid enough that it will not slide around when multiple cables are connected. The lack of Power over Ethernet (PoE) is one area that has already drawn attention, as many users favour a simplified single-cable setup that combines power and network.

Instead, the Pro model must rely on USB-C power delivery or its bundled 10 W PSU, which while flexible, requires additional cabling. GL.iNet has confirmed that PoE support is reserved for its separate Comet PoE model, meaning the Pro prioritises wireless and accessory integration instead. Even so, its physical layout and cable-friendly design suggest it is intended for regular use in homelabs, testing environments, or small professional deployments where convenience and low-profile form factor matter more than absolute minimal wiring.

GL.iNet Comet Pro Review – Internal Hardware & Storage

Inside the Comet Pro, GL.iNet has opted for a quad-core ARM Cortex-A53 processor paired with 1GB of DDR3 memory. This is a significant step up from entry-level KVM devices that rely on single-core or lower-clocked CPUs with a fraction of the RAM. In practice, this extra horsepower allows the Comet Pro to handle simultaneous HDMI input and passthrough, touchscreen responsiveness, and background tasks like network services without becoming sluggish. During testing, the system was able to manage multiple connections while remaining responsive, though the limited RAM may still cap future feature expansions. The use of DDR3 memory rather than newer DDR4 or LPDDR standards reflects a balance between cost and compatibility, keeping the device affordable while still delivering adequate performance for its class.

For storage, the Comet Pro is equipped with 32GB of onboard eMMC. This capacity is well above the minimal storage seen in many competing KVM devices, and it serves two primary functions. First, it can be used to host multiple ISO images, allowing the user to boot or reinstall different operating systems remotely without attaching physical media. Second, it can act as a mounted USB drive that provides read and write access to files directly from the host system. While these features add flexibility, the storage has limits. The lack of an SD card slot or USB-based expansion option means the 32GB is fixed, and transfer speeds during testing averaged between 23–25 MB/s. This is sufficient for smaller ISO files or driver discs but noticeably slower when handling larger media.

The choice of eMMC storage also reflects GL.iNet’s attempt to balance convenience with simplicity. eMMC is compact, inexpensive, and integrated directly onto the board, reducing complexity compared to SATA or NVMe alternatives. However, this comes at the cost of speed and upgradability. For most use cases—boot images, firmware updates, and light file transfers—the built-in storage will suffice. Yet users hoping to load multiple large OS images or transfer substantial file sets may find the limits more apparent. Overall, the hardware inside the Comet Pro prioritises straightforward functionality and self-contained operation, providing just enough headroom to support modern usage without straying into higher-cost hardware that would push the device beyond its current Kickstarter pricing tiers.

GL.iNet Comet Pro Review – Ports and Connections

The Comet Pro provides a straightforward but practical set of external connections designed to balance usability with broad compatibility. On the rear panel, users will find a Gigabit Ethernet port, USB-C power input, a USB-A accessory port, and two full-sized HDMI ports for input and output. Unlike some compact KVMs that opt for mini HDMI or USB-based video, GL.iNet has chosen to include full HDMI, reducing the reliance on adapters and making the unit easier to integrate directly into PCs, NAS systems, or servers. This makes it more suitable for users who want a clean installation without juggling conversion cables. The layout also keeps ports well separated, which helps prevent cable congestion when all are in use.

One of the standout design choices is the dual HDMI configuration, offering both an input for capturing video from the host system and a passthrough for maintaining a local display connection. This allows the device to operate in the background without interrupting a user’s normal monitor setup, an advantage for environments where physical access is still required while also keeping remote access enabled. The USB-A port expands functionality further by supporting accessories such as the optional ATX power board and Fingerbot, which extend control over physical system states. These add-ons use standard USB 2.0 signalling, keeping integration simple, while enabling functions like remote power cycling or triggering a hardware reset at the press of a button.

Networking is handled through a single RJ45 Gigabit Ethernet port alongside built-in Wi-Fi 6 support, giving the user flexibility between wired and wireless setups. While the Ethernet interface provides the most stable connection, the inclusion of dual-band Wi-Fi means the Comet Pro does not require a physical LAN cable in every scenario, broadening its deployment options for homelab users or portable testing environments. However, the device lacks Power over Ethernet (PoE) capability, meaning power and network must be provided separately. GL.iNet has directed PoE-focused users to their Comet PoE variant, leaving the Pro model better suited for those prioritising wireless convenience and accessory integration.

• 1 × RJ45 Gigabit Ethernet (10/100/1000)

• 1 × USB Type-C (Power Input, 5V 2A with PD support)

• 1 × USB 2.0 Type-A (Accessory connection, e.g., ATX board, Fingerbot)

• 1 × HDMI Input (Full size)

• 1 × HDMI Output (Full size, passthrough up to 4K@30fps)

GL.iNet Comet Pro Review – Performance and Tests

In practical testing, the Comet Pro demonstrated stable operation across both local and remote connections. When deployed on a local area network over Gigabit Ethernet, video output remained smooth, with latency kept to levels that were difficult to notice in everyday use. The passthrough HDMI supported up to 4K at 30 FPS or 1080p at 60 FPS, making it suitable for both configuration tasks and lighter remote interaction. While not designed for high-performance gaming, the device handled operating system installations, BIOS configuration, and desktop navigation without visible delay. Remote testing via GL.iNet’s relay service also showed responsive behaviour, though these tests were conducted early in the campaign with relatively few users active, making it unclear how well the service will scale under heavier demand.

The device’s quad-core ARM Cortex-A53 processor and 1GB of RAM proved sufficient to manage transcoding and stream adjustments when accessing via browser or desktop applications. The integrated H.264 encoding allows the unit to downscale or compress the video feed to accommodate lower-bandwidth scenarios, ensuring remote sessions remained usable even when connection quality fluctuates.

Audio support, both through HDMI and USB, added another layer of functionality for remote collaboration or troubleshooting, though microphone activation required restarts to take effect. During prolonged use, the touchscreen interface remained responsive, and system access features such as security PINs and two-factor authentication functioned as expected, providing a secure operating baseline.

Storage performance, while not fast, was consistent. Writing data to the 32GB eMMC averaged between 23–25 MB/s, which was sufficient for uploading ISO images and driver discs but noticeably slower for large files. Virtual media mounting worked reliably, allowing ISO files to be presented to the host system as if they were locally connected USB drives.

File sharing via the remote mount function extended this further, making the KVM’s internal storage act as a conventional drive from within the connected operating system. This feature proved useful for transferring smaller files such as utilities or configuration scripts but was limited by the inherent speed of the eMMC storage.

Power consumption during testing remained low, with idle draw measured between 1.5 and 2.5 W and heavier operation drawing up to 4.5 W. Temperatures were also within safe limits, peaking at around 49°C under continuous use with all ports occupied. Importantly, the system did not throttle or show instability during extended testing periods.

While the absence of PoE limited deployment flexibility, the ability to power the device either via the included 10 W PSU or from a client USB port added some versatility. Taken as a whole, the performance tests suggest that the Comet Pro is capable of delivering reliable day-to-day remote access for administrative tasks, though it is not intended for high-throughput or latency-sensitive workloads.

• Video Output: 4K@30 FPS, 1080p@60 FPS

• Encoding: H.264 hardware encoding confirmed

• Average Latency: ~30–60 ms (local and remote, tested)

• Storage Write Speed: 23–25 MB/s (32GB eMMC)

• Idle Power Draw: 1.5–2.5 W

• Active Power Draw: Up to 4.5 W

• Operating Temperatures (Tested): 40–49°C surface depending on panel location

Comet Pro vs JetKVM – Which Should You Buy?

When comparing the Comet Pro to the JetKVM, the most immediate difference is in hardware resources. The Comet Pro offers a quad-core ARM Cortex-A53 processor, 1GB of DDR3 memory, and 32GB of eMMC storage, while the JetKVM relies on a single-core Cortex-A7 CPU with 256MB of RAM and either 4GB or 16GB of eMMC depending on version. This gives the Comet Pro considerably more capacity to handle multiple connections, virtual media, and remote management tasks. The inclusion of a larger 2.22-inch touchscreen further expands its usability, particularly for setup and local controls, whereas JetKVM uses a smaller 1.69-inch panel with more limited functions. From a purely technical perspective, the Comet Pro is the more capable unit, but this comes with a higher entry price.

Networking and connectivity also reveal differing priorities. The Comet Pro includes both Gigabit Ethernet and Wi-Fi 6 dual-band support, allowing deployment without wired LAN, while the JetKVM only provides a 100 Mbps Ethernet port and no wireless option. JetKVM compensates for this with a lightweight, open-source software stack built around WebRTC, which emphasises speed and hackability for developers. It also features an RJ11 extension port for add-ons such as ATX control boards and DC power modules, encouraging community-built extensions. The Comet Pro instead integrates accessory support through USB, offering officially developed add-ons like the ATX board and Fingerbot, but with less emphasis on third-party modification. In short, JetKVM is more open and extensible, while Comet Pro is more self-contained and focused on out-of-the-box deployment.

Price and ecosystem support are another dividing factor. JetKVM launched on Kickstarter at $69 and built momentum on being affordable, transparent, and entirely open source. The Comet Pro starts at $99 for early backers and scales up to $155 for bundles, reflecting its higher hardware cost and added features. JetKVM’s community-driven development and open licensing have made it popular with enthusiasts who value hackability and long-term flexibility, whereas GL.iNet’s approach with the Comet Pro aligns more with a polished, consumer-ready appliance that still integrates optional remote cloud services. Choosing between them comes down to priorities: those seeking raw affordability and open-source collaboration may lean toward JetKVM, while those preferring a more powerful, integrated, and wireless-capable KVM will find the Comet Pro the stronger candidate.

GL.iNet Comet Pro Review – Conclusion & Verdict

The Comet Pro stands out as a more advanced and accessible interpretation of the compact KVM concept, incorporating stronger internal hardware, built-in storage for ISO management, and dual HDMI with passthrough that makes it practical for both remote and local use. The addition of Wi-Fi 6 support expands deployment flexibility, removing the need to always run physical network cables, while the integrated touchscreen interface allows for quick setup and control without relying solely on external software. During extended tests, it maintained stable operation with modest temperatures and low power consumption, making it suitable for continuous use in homelabs or small offices. The inclusion of accessory support, such as the ATX board for full remote boot control and the Fingerbot for physical power cycling, highlights GL.iNet’s attempt to broaden its appeal beyond simple KVM duties into more complete system management. At the same time, limitations such as fixed 32GB eMMC storage with no expansion options, reliance on external power rather than PoE, and the use of only 1GB of RAM show that the product remains firmly aimed at the consumer and prosumer segment rather than enterprise-grade installations.

When placed against the JetKVM, the decision largely depends on what the user values most in a remote management device. JetKVM has built its reputation on affordability, transparency, and openness, offering a $69 price point, an entirely open-source software stack, and an extension port that allows for custom add-ons developed by the community. For enthusiasts, developers, and those who prefer long-term flexibility, it remains an appealing choice.

In contrast, the Comet Pro arrives at a higher entry cost of $99–$155 depending on bundle but compensates with significantly stronger specifications, built-in wireless connectivity, and a more polished, consumer-ready experience that does not require modification or third-party involvement to be fully functional. Kickstarter progress, with more than £200,000 pledged and nearly 2,000 backers already, suggests demand for such a ready-made solution exists. For users who want a stable appliance with a straightforward setup process and modern hardware, the Comet Pro provides the stronger option. For those prioritising hackability and community-driven development above convenience, JetKVM remains the leaner and more customisable alternative.

Comet Pro KVM PROs

Comet Pro KVM PROs

Quad-core ARM Cortex-A53 CPU and 1GB RAM provide stronger performance than typical compact KVMs 32GB of built-in eMMC storage for ISO mounting and virtual media use Full-sized HDMI input and passthrough output, up to 4K@30 FPS or 1080p@60 FPS Dual connectivity with Gigabit Ethernet and Wi-Fi 6 support 2.22-inch touchscreen for setup, security PIN entry, and local management Low power consumption, averaging 1.5–4.5 W depending on workload Expandability via USB accessories such as the ATX board and Fingerbot Complete set of required cables included in the box for immediate use

Fixed 32GB eMMC storage with no SD card or external storage expansion No Power over Ethernet (PoE) support, requiring separate power cabling Only 1GB of RAM, which may limit future software updates or heavier tasks

 

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