SmartAVI

SmartAVI SKMN-4S 4-Port Secure KM Switch with KB/Mouse USB Emulation

Expert rating7.6 / 10

Port Count:: 4
Video Standard:: N/A (KM only, no video)

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Manufacturer: SmartAVI Last updated: 2026-09-12

SmartAVI SKMN-4S 4-Port Secure KM Switch with KB/Mouse USB Emulation Review

SmartAVI SKMN-4S secure 4-port KM switch keyboard mouse USB emulation classified government office isolated peripheral sharing NIAP compliant

The SKMN-4S lets one keyboard and mouse control four isolated computers without ever routing video through the switch, so it fits desks where only peripheral sharing is needed and each PC's display stays on its own dedicated monitor or matrix feed. USB emulation means each host sees a persistent, well-behaved keyboard/mouse even while switching, avoiding the driver re-enumeration hiccups cheaper KM switches cause.

What KM-Only Switching Buys You

Because the SKMN-4S never touches the video path, it sidesteps the biggest attack surface in a secure KVM: shared display buffers. Agencies running four independently air-gapped networks that already have dedicated monitors per system can add single-keyboard convenience without expanding the switch's certification scope to include video isolation at all.

USB Emulation in Practice

Each connected computer sees a constant, emulated keyboard and mouse identity regardless of which physical port is active, so there's no USB re-enumeration delay or driver prompt when the operator presses the front-panel selector. This matters in SCIFs and NOCs where a hung USB stack mid-shift is not an acceptable failure mode.

Comparison to Alternatives

Where the Belkin F1DN102KVM-UN and Vertiv Avocent SwitchView SC920 both switch full video plus peripherals for 2 computers, the SKMN-4S trades video switching for twice the port count at a lower price point, making it the better pick when displays are already dedicated per system. Step up to the SmartAVI SKMN-4S-P if a CAC/smart-card reader path is also required.

Our verdict

Reviewed by Burooj Alam. Rated by us, not by users.

Expert rating7.6 / 10

A focused, affordable KM-only secure switch — buy it when your video paths are already separate and you just need one keyboard/mouse across four isolated hosts.

Best for

Multi-network SOC desks with dedicated per-system monitors
Classified facilities standardizing on isolated USB HID switching
Budget-conscious 4-system secure desks that don't need CAC pass-through

Not for

Environments requiring CAC or smart card authentication switching
Desks needing shared video/display switching, not just KM
Single-computer or two-computer setups better served by simpler switches

Specifications

What these specs mean

Design

Port Count	4
Switching Method	Front-panel pushbutton

Topology

KVM Segment	Secure

Video & Features

Video Standard	N/A (KM only, no video)
USB Hub Ports	2
Audio Support	No

In the box and price

Price	486.75 USD

FAQs

What are the key specifications of the SmartAVI SKMN-4S 4-Port Secure KM Switch with KB/Mouse USB Emulation?

The SmartAVI SKMN-4S 4-Port Secure KM Switch with KB/Mouse USB Emulation is a KVM switch from SmartAVI. Key specs: Port Count 4, Switching Method Front-panel pushbutton, Video Standard N/A (KM only, no video), Max Resolution N/A, USB Hub Ports 2.

Who is the SmartAVI SKMN-4S 4-Port Secure KM Switch with KB/Mouse USB Emulation best suited to?

Best suited to: Multi-network SOC desks with dedicated per-system monitors; Classified facilities standardizing on isolated USB HID switching; Budget-conscious 4-system secure desks that don't need CAC pass-through.

What are the drawbacks of the SmartAVI SKMN-4S 4-Port Secure KM Switch with KB/Mouse USB Emulation?

Not the best fit for: Environments requiring CAC or smart card authentication switching; Desks needing shared video/display switching, not just KM; Single-computer or two-computer setups better served by simpler switches.