Resolution and refresh rate are one figure, and the switching method is the other · review
CMSTEDCD GMXUS-SW219S review
The cheapest American listing on this shelf, publishing its resolution and rate as a pair and stating outright the three things it will not do: hotkeys, Mac machines, and an HDMI lead in the box.
Two computers, one screen, $16.99. At that price the interesting question is what has been left out, and this listing answers it three times over without being asked.
The third bullet states in as many words that hotkey switching is not supported. Changing machine is done by the button on the body or by the wired desk controller, which the same bullet suggests letting the unit hide behind the monitor while the controller stays in reach. Two methods, both physical, and no keyboard shortcut — which four listings on this shelf do offer.
The fifth bullet states that the unit is not recommended for use with Mac devices, for compatibility reasons. The sixth states that no HDMI cable is in the package, which contains the switch, a desktop controller, two USB 2.0 cables, a service card and a manual, and that no external power supply is needed because the unit draws what it needs from the computers.
The video ceiling is 4K at 60 Hz, stated in the second bullet as a pair and listed backwards-compatible with 3840 by 2160 at 30 Hz, 1920 by 1080 at 60 Hz and 1920 by 1080 at 30 Hz. That bullet carries two conditions of its own: the HDMI lead must be an HDMI 2.0 one no longer than 3.3 feet, and the computers and the screen must themselves support 4K. The first bullet adds that conversion cables and adapters may give an unstable or flickering picture, or none at all.
The USB side is two sockets at USB 2.0, quoted at up to 480 Mbps in the fourth bullet, which also states that the unit is hot-swappable and that the active machine is shown by color — green for the first, blue for the second. Two sockets is the smallest count published on this shelf among the units that publish one at all.
The sixth bullet closes with a 24-month replacement offer. Three other listings on this shelf state a term — twelve months each, on the AV Access and the two DXchip units — so this is the longest one named anywhere here. At a recorded 60 g (2.1 oz) and 98 by 60 by 16 mm (3.9 × 2.4 × 0.63 in) it is the lightest and smallest of the units here with a recorded weight by a wide margin, and that is what makes hiding it behind the screen a real suggestion rather than a figure of speech.
Prices quoted in this text were read on October 26, 2026. The live price is at the top of the page.
Where it holds up, and where it stops
Strengths
The cheapest American listing on this shelf, and the resolution and rate are still published as a readable pair
States outright that hotkey switching is not supported, rather than leaving a buyer to find out
Twenty-four months of replacement, the longest term named anywhere on this shelf
Needs no external power supply, and the active machine is shown by color rather than by a number to interpret
Sixty grams and 16 mm (0.63 in) thick, so the suggestion of hiding it behind the monitor is a practical one
Compromises
Two USB 2.0 sockets is the smallest count published on this shelf, at the same USB 2.0 generation and the same 480 Mbps as two of the VGA listings here
Not recommended for Mac machines, stated in the fifth bullet for compatibility reasons
No HDMI lead in the box, and the one to buy must be HDMI 2.0 and no longer than 3.3 feet
No audio connection of any kind is named, and two computers is the smallest port count here
Specifications
Port count
Two — stated in the title and in the first bullet as two computers sharing one monitor and one keyboard and mouse set
Maximum resolution
4K — stated in the title and in the second bullet as up to 4K at 60 Hz, backwards compatible with 3840 by 2160 at 30 Hz, 1920 by 1080 at 60 Hz and 1920 by 1080 at 30 Hz. The same bullet requires that the computers and the screen support 4K themselves
Refresh rate
60 Hz at 4K — stated in the second bullet as a pair, which is the form in which the two figures can be read together, with 30 Hz named at the same resolution as the fallback
Video connector type
HDMI — stated in the title and in the first bullet, which requires an HDMI port on each computer and on the monitor and warns that conversion cables or adapters may give an unstable or flickering picture. The second bullet asks for an HDMI 2.0 lead no longer than 3.3 feet
Screens per computer
One — stated in the title as two computers sharing a single monitor
USB port count
Two — stated in the fourth bullet as two USB 2.0 sockets, for a wired keyboard and mouse or other USB 2.0 devices
USB generation
USB 2.0, quoted at up to 480 Mbps — stated in the fourth bullet, which adds that the unit is hot-swappable and needs no reboot to accept a device
Switching method
Two, both physical — a button on the body and a wired desk controller, stated in the third bullet, which also states plainly that this switch does not support hotkey switching
Audio support
Not published on the listing — no audio socket, no channel arrangement and no speaker or microphone connection is named in the title or in any of the six bullets
Cables supplied
The switch, a desktop controller, two USB 2.0 cables, an after-sales card and a manual — stated in the sixth bullet, which also states that no HDMI cable is included and that no external power supply is needed. A 24-month replacement offer is named in the fifth
Amazon reference
B0H5BKH7NN
EAN
0684646024356
On Amazon.com
Amazon.com had an offer at $17 on October 26, 2026.
Where this unit differs
Put against the median of its own group on this site — not against every network product sold.
Maximum resolution4K — stated in the title and in the second bullet as up to 4K at 60 Hz, backwards compatible with 3840 by 2160 at 30 Hz, 1920 by 1080 at 60 Hz and 1920 by 1080 at 30 Hz. The same bullet requires that the computers and the screen support 4K themselves-50 % against the median of this group
USB port countTwo — stated in the fourth bullet as two USB 2.0 sockets, for a wired keyboard and mouse or other USB 2.0 devices-33 % against the median of this group
The questions that come up before an order
Can the machine be changed from the keyboard?
No. The third bullet states that this switch does not support hotkey switching. The two methods are the button on the body and the wired desk controller supplied with it.
Does an HDMI cable come with it?
No. The sixth bullet lists the switch, a desktop controller, two USB 2.0 cables, a service card and a manual, and states that the HDMI cable is not included. The second asks for an HDMI 2.0 lead of 3.3 feet or less.
Will it work with a Mac?
The fifth bullet states that for compatibility reasons this switch is not recommended for use with Mac devices.
Against the rest of the network and storage gear
This network and storage gear share the category and the price bracket. Only what each one states is shown; an incomplete column would mislead.
Model
Price
Port count
Maximum resolution
Refresh rate
Video connector type
CMSTEDCD GMXUS-SW219S
$17
Two — stated in the title and in the first bullet as two computers sharing one monitor and one keyboard and mouse set
4K — stated in the title and in the second bullet as up to 4K at 60 Hz, backwards compatible with 3840 by 2160 at 30 Hz, 1920 by 1080 at 60 Hz and 1920 by 1080 at 30 Hz. The same bullet requires that the computers and the screen support 4K themselves
60 Hz at 4K — stated in the second bullet as a pair, which is the form in which the two figures can be read together, with 30 Hz named at the same resolution as the fallback
HDMI — stated in the title and in the first bullet, which requires an HDMI port on each computer and on the monitor and warns that conversion cables or adapters may give an unstable or flickering picture. The second bullet asks for an HDMI 2.0 lead no longer than 3.3 feet
Four — stated in the title and in the first bullet as four computers or laptops managed from one place
1920 by 1440 — stated in the second bullet, which adds that a very wide screen is also supported. It is the ceiling of the switch alone; the computers and the screen each impose their own
Not published on the listing — no figure in Hz appears in the title or in any of the five bullets, so the resolution stands without the second half of the pair
VGA — stated in the title and in the first bullet, with one screen at the output
Three — stated in the title and in the first bullet as three computers sharing two DisplayPort monitors and four USB 3.0 devices. It is the only three-computer unit on this shelf
8K, given as 7680 by 4320 — stated in the title and in the second bullet at 30 Hz, with 3840 by 2160 at 144 Hz also named and lower resolutions supported. The same bullet states that the sources, the monitors and the DisplayPort leads must all support the figure to reach it
30 Hz at 8K and 144 Hz at 4K — stated in the second bullet as pairs, which is the form in which the two figures can be read together. The same maker’s HDMI 2.1 unit on this shelf publishes 60 Hz at 8K and the same 144 Hz at 4K
DisplayPort 1.4 — stated in the title and in the second bullet, with two DisplayPort inputs required from each machine and two DisplayPort outputs to the screens
Two — stated in the title and in the first bullet as two desktop computers
8K — stated in the title and in the second bullet as up to 8K at 60 Hz, backwards compatible with 8K at 30 Hz, 4K, 1080p, 720p and 480p. It is the ceiling of the switch alone; the computers and the screens each impose their own
60 Hz at 8K, with 8K at 30 Hz also named — stated in the second bullet as pairs, which is the form in which the two figures can be read together
DisplayPort 1.4 — stated in the second bullet; the first bullet states in as many words that this switch has no HDMI socket
What separates the models, in network and storage gear
If price decides: this model, at $17.
The buyer this one serves, among network and storage gear
Two Windows machines on one HDMI screen, where the switch should cost less than the cable and stay out of sight.
What this one costs among network and storage gear
Details checked on October 26, 2026.
What buyers actually choose
Amazon reports what buyers took in the month before this page was last checked: at least 1,000.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Sources
Specifications: the manufacturer sheet for network and storage gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
two computers · one screen · 3840 by 2160 at 60 Hz · HDMI · button, wired remote, web or app · every lead in the box
A two-computer switch whose packing list is the only complete one on this shelf, down to the HDMI lead and the jumper wires for remote power, and whose web access and app are given two different reaches in one bullet.
Best for: A pair of desktop machines that have to be reached, switched and powered on from somewhere else, with nothing left to buy.
four computers · one screen · 4K at 60 Hz and 2K at 100 Hz · one DisplayPort, one USB-C and two HDMI inputs · four USB 3.0 at 5 Gbps · button or wired remote
A four-computer switch whose inputs are of three different kinds, quoting its resolutions and refresh rates as pairs and never listing what is in the box.
Best for: A desk where the four machines do not share a video socket between them, and where a drive has to follow whichever one is in use.
two laptops · two HDMI screens each · 4K over USB-C · seven USB sockets · Ethernet, SD and headset · 60 W charging each
A docking station that switches as well, carrying two screens, Ethernet, an SD slot, a headset jack and 60 W of charging for each laptop, and publishing no refresh rate at all.
Best for: A desk where a work laptop and a personal one share two screens, the network, the card reader and a charger as well as the keyboard.