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CMSTEDCD GMXUS-SW221 Dual-Monitor HDMI KVM Switch1 / 7
Product guide

CMSTEDCD GMXUS-SW221 Dual-Monitor HDMI KVM Switch

Dual-Monitor: CMSTEDCD GMXUS-SW221 is a two-computer HDMI KVM switch for sharing two monitors and up to four USB devices. The listing claims support up to 8K at 60Hz or 4K at 120Hz, but dual-display extension requires each computer to provide two HDMI outputs and support extended displays.

At a glance

  • Switches keyboard, mouse and other connected USB devices between two computers, with up to four USB devices shared.
  • Supports two monitors in copy or extended-display mode, subject to the computers' graphics outputs and display capabilities.
  • The listing claims up to 8K@60Hz or 4K@120Hz. It says cables and connected equipment must support the target mode.
  • Selection is available from the unit's buttons or the included external wired controller. Keyboard hotkey switching is not supported.
Price
$59.49Save 15%

Reference price: $69.99

Price checked: Nov 12, 2026

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Pros and cons

Pros

  • Four USB 3.0 ports provide a shared connection point for peripherals such as printers, scanners, webcams, keyboards and mice.
  • The included external controller offers a switching option away from the switch itself.
  • The listing specifies compatibility with USB 2.0 devices and several Windows, Mac, Linux and Unix systems.

Cons

  • Computers need two HDMI outputs each for extended dual-monitor use. A single-monitor computer cannot gain dual-display capability from this switch.
  • Keyboard shortcut switching is not supported.

Technical specifications

15 specifications
Identity
BrandCMSTEDCD
ModelGMXUS-SW221-Deep Blue
Display and USB connectivity
Display connectionsTwo HDMI ports
USB hubFour USB 3.0 ports
USB data transfer speed5Gbps
Supported systemsWindows, Vista, XP, Mac OS, Linux, and Unix systems
Switching and display modes
Computers and monitors2 computers and 2 monitors
Maximum claimed resolution and refresh rate8K@60Hz and 4K@120Hz
Other listed resolutions4K@60Hz, 1080P, and lower resolutions
Control methods listedPush Button
Power and compatibility
Power adapter12V power adapter
USB device power guidanceFor high-power USB devices, use the included 12V power supply.
Dimensions and installation
Mounting types listedPanel Mount
Dimensions listed5.91 x 2.56 x 1.42 inches
Materials and protection
Material listedMetal

What to know before buying

  • The listing's 8K@60Hz and 4K@120Hz claims depend on compatible source devices, displays and cables. For 4K@120Hz, the listing specifically requires cables and the hub to support that mode.

Listing details to confirm

The listing details are contradictory or inconsistent: the product title and feature text claim dual-monitor switching for two computers, while some generic product-detail fields describe a one-position, two-way push-button electrical switch. Confirm the selected model and its port layout before purchase. High-power USB peripherals are advised to use the included 12V adapter. The title mentions a desktop controller and two USB cables, while the explicit included-components field lists only two USB 3.0 cables. The controller and other kit contents are therefore not confirmed by that contents list. The listing describes a 12-month warranty in one feature and a two-year replacement promise elsewhere, so the coverage term is unclear.

What’s in the box

  • 2 USB 3.0 cablesIncluded
  • External wired controllerCheck selected pack
  • 12V power adapterCheck selected pack

Check which accessories are included in your selected pack before buying.

Who is it for?

A good fit for

  • Users switching a keyboard, mouse and other USB peripherals between two computers.
  • Setups where both computers can provide two HDMI outputs and support the desired dual-monitor mode.
  • Users who want a physical button or wired external controller rather than keyboard hotkeys.

Less suited to

  • Computers that only support one monitor when extended dual-screen output is required.
  • Setups that require hotkey-based switching or need the switch itself to add display outputs the computer does not have.
CMSTEDCD GMXUS-SW221 Dual-Monitor HDMI KVM Switch · photo 2
Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 1,169 ratings
  • 5 stars77%77%
  • 4 stars7%7%
  • 3 stars3%3%
  • 2 stars3%3%
  • 1 star10%10%

Customer feedback describes the switch as easy to set up and convenient for changing between devices, with reported appreciation for 4K picture quality, quick switching and a tidier desk. Those impressions suit the listed two-computer, two-monitor and four-USB-port configuration, but they do not establish that every setup will reach the advertised refresh rates. Connectivity feedback is mixed, with some customers reporting compatibility issues, making source outputs, cables and monitor support important to confirm.

Positive themes

  • Customers report easy setup and convenient switching.
  • Customers mention 4K picture quality, quick switching and improved desk organization.

Mixed feedback

  • Connectivity experiences are mixed, with some customers reporting compatibility issues.

Frequently asked questions

Can this switch extend displays across two monitors?

The listing says it supports extension mode, but each computer must have two HDMI outputs and support extended displays. It cannot enable dual-monitor output on a computer limited to one monitor.

Does it support 4K at 120Hz?

The listing claims 4K@120Hz, conditional on compatible cables and connected equipment. The source specifically says the cable and hub must support 4K@120Hz.

Can I switch computers with keyboard shortcuts?

No. The listing says switching is by the switch's buttons or its external wired controller, and keyboard hotkeys are not supported.

Does it include a desktop controller and two USB cables?

The title claims a desktop controller and two USB cables, but the explicit contents field lists two USB 3.0 cables only. Controller inclusion is not confirmed by that list, so check the selected listing.

Does it include a power adapter?

The feature text says a 12V power adapter is included and recommends using it with high-power USB peripherals. The package contents field does not separately enumerate the adapter.

CMSTEDCD GMXUS-SW221 Dual-Monitor HDMI KVM Switch · photo 3
Additional product photo 3

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