Aten VS491 4 Port Video Switch(VS-491)

Electronic Switching For Greater Reliability and Durability Displays the Output of Two (VS-291) or four (VS-491) Computers on a Single Monitor High Resolution Video - Up To 1920 x 1440; DDC; DDC2; DDC2B Supports, VGA, SVGA, XGA and Multisync Monitors or equivilent multimedia projector Easy Installation - No Software Required - No Configuration Necessary Computer Selection via Pushbutton Switch.