Selects pcs by using push buttons on top panel connecting to computer by usb 3 0 b type port and connecting to device by usb3 0 a type compliant to usb 3 0 specification down compatible with usb 2 0 and usb 1 1 usb 3 0 data transfer rate up to 5gbps supports windows 2000xpvista7 mac os 10 x