Startech com usb421hs 4 to 1 usb 2 0 peripheral sharing switch startech com usb421hs p this 4 to 1 usb switch box from startech com allows a usb 2 0 device to be shared with up to 4 different computer systems without having to disconnect and reconnect the cabling every time push button controls makes switching between computers quick and easy with additional keyboard hot key switching and windows reg based software also available p p with no external power adaptor required and with i