The KVM-DVUSB04 is a compact sturdy four port DVI-I KVM switch with USB (Universal Serial Bus) keyboard & mouse support plus one extra USB (Universal Serial Bus) device. Supports both DVI-A & DVI-D signals. Specification 4 Port DVI-I Switch USB (Universal Serial Bus) Support Single Link Supports Resolutions up to 1920 x 1200 @ 60 Hz Control 4 computers via USB (Universal Serial Bus) keyboard & mouse Supports USB (Universal Serial Bus) Keyboard/ Mouse Plug n Play Auto Scan Function Metal Case 5v Power Port (PSU Optional)