Review on NEWCARE HDMI KVM Switch: 4K@60Hz, 2x1 HDMI2.0 Ports + 3X USB KVM Ports - Share 2 Computers on UHD Monitor, with Wireless Keyboard and Mouse Support - USB Disk, Printer, USB Camera Compatible by Chris Santos

I'm using this to use a wireless keyboard and mouse and a second monitor between two Win10 laptops. The keyboard/mouse combo uses a universal Logitech wireless dongle that plugs into one USB port on the KVM, freeing the other two USB ports for general use. This setting works great. The shared monitor has a resolution of 2560 x 1440, 60Hz, which is less than the KVM limit of 4K, so I can't say how it will handle 4K video. But FWIW, the video signal is perfectly switched and displayed on the general monitor. In general, everything works as I want without any problems.