Bom estado.Aten VS491 is a video switch with 4 ports. It allows 4 independent computers to display their video outputs on a single monitor. Therefore, users will not need to buy monitors for each computer additionally.

ATEN (VS491) 4 Port Video Switch Features and Benefits:
Electronic switching for greater reliability and durability.
Displays the output of four computers on a single monitor.
High resolution video - up to 1920 x 1440 (10m) ; DDC2B.
Supports VGA, SVGA, XGA and multisync monitors.
Computer selection via pushbutton switch(manual).