USB sharing is a great solution for sharing USB devices like USB printer, scanner, external or other USB device; and you could freely switchbetween these 4 computers by a single push button
Down Input: USB 2.0x4 ; keyboard, mouse, scanner, printer, U Disk,or USB
Plug and for play, no driver required : Application scenarios: computers, for smart phones,
Support to 5Gbps; backward for USB 1.1 devices, for 10 8.6
UP Input: USB 4; the USB of the computer host