Switch between two computers sharing four dvi displays speakers mic usb keyboard mouse and usb 20 peripheral the sv231qdviua 2 port quad monitor dual link dvi usb kvm switch allows 2 pcs each with 4 dvi video outputs to share monitors 1 microphone and set of speakers 1 keyboard and 1 mouse as well as an additional usb 20 peripheral such as an external hard drive thumb drive printer or webcam the quad dvi kvm switch allows you to switch back and forth between 2 multi dvi pcs