This high qualitative dvi kvm switch allows the simultaneous or separate control of up to four pcs supports audio and additional two usb peripherals like scanner printer camera or something else controls 4 computers with dvi video from a single console keyboardmouse over usb integrated usb hub four computers can share two usb downstream ports usb 20 compliant provides hub switching in independent method or combination with the host switching usb hub auto switch mode provides aud