SmartAVI SM-UHN-4S
Expert rating7.9 / 10
- Port Count:
- 4
- Video Standard:
- HDMI
- Max Resolution:
- 4K@30Hz
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Manufacturer: SmartAVI Last updated: September 12, 2026
SmartAVI SM-UHN-4S (4-Port HDMI 4K KVM Switch with USB Hub / $427.79) Review
The SmartAVI SM-UHN-4S is a 4-port single-head HDMI KVM switch supporting 4K@30Hz, a 2-port USB hub, and audio switching, priced at $427.79.
SmartAVI's SM-UHN-4S covers the single-monitor, four-machine case in its HDMI switch lineup: one 4K output, four selectable HDMI sources, front-panel pushbutton or hotkey switching, and a small USB hub for keyboard/mouse plus a spare peripheral port. It's a more affordable option than SmartAVI's dual-head SM-D2H series for buyers who only run one display. Versus the SmartAVI SM-D2H-4S-S — that adds a second monitor output per source for multi-screen setups, worth the extra cost only if dual monitors are actually in use. Versus the ATEN CS1824 — comparable single-head 4-port 4K@30Hz spec at a similar price, largely a brand preference decision.
Single-Head 4K Switching for Four Sources
SmartAVI's SM-UHN-4S covers the single-monitor, four-machine case in its HDMI switch lineup: one 4K output, four selectable HDMI sources, front-panel pushbutton or hotkey switching, and a small USB hub for keyboard/mouse plus a spare peripheral port.
A More Affordable Alternative to Dual-Head Models
It's a more affordable option than SmartAVI's dual-head SM-D2H series for buyers who only run one display.
Comparison to Alternatives
Versus the SmartAVI SM-D2H-4S-S — that adds a second monitor output per source for multi-screen setups, worth the extra cost only if dual monitors are actually in use. Versus the ATEN CS1824 — comparable single-head 4-port 4K@30Hz spec at a similar price, largely a brand preference decision.
Specifications
Design
| Port Count | 4 |
|---|---|
| Switching Method | Front-panel pushbutton + hotkey |
Topology
| KVM Segment | Desk |
|---|
Video & Features
| Video Standard | HDMI |
|---|---|
| Max Resolution | 4K@30Hz |
| USB Hub Ports | 2 |
| Audio Support | Yes |
In the box and price
| Price | 427.79 USD |
|---|
| Brand | SmartAVI |
|---|---|
| Model | SM-UHN-4S |
| Spec Score | 4.4 |
| Monitors | 1 |
| USB-C Power Delivery | No |
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Expert rating7.9 / 10
A dependable single-monitor 4-port 4K HDMI switch, priced right for desks that don't need a second display.
Best for
- Single-monitor desks switching between 4 HDMI sources
- Buyers who want a small USB hub and audio switching included
- Cost-conscious upgrades from a basic non-4K HDMI switch
Not for
- Dual-monitor setups (see the SM-D2H-4S-S)
- Buyers needing 60Hz refresh at 4K
- Setups needing more than 4 ports
FAQs
What are the key specifications of the SmartAVI SM-UHN-4S (4-Port HDMI 4K KVM Switch with USB Hub / $427.79)?
The SmartAVI SM-UHN-4S (4-Port HDMI 4K KVM Switch with USB Hub / $427.79) is a KVM switch from SmartAVI. Key specs: Port Count 4, Switching Method Front-panel pushbutton + hotkey, Video Standard HDMI, Max Resolution 4K@30Hz, USB Hub Ports 2.
Who is the SmartAVI SM-UHN-4S (4-Port HDMI 4K KVM Switch with USB Hub / $427.79) best suited to?
It suits single-monitor desks switching between 4 hdmi sources, buyers who want a small usb hub and audio switching included, cost-conscious upgrades from a basic non-4k hdmi switch.
What are the drawbacks of the SmartAVI SM-UHN-4S (4-Port HDMI 4K KVM Switch with USB Hub / $427.79)?
It is a poor fit for dual-monitor setups (see the sm-d2h-4s-s), buyers needing 60hz refresh at 4k, setups needing more than 4 ports.
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