Aten VPK104 4-Key Contact Closure Remote Pad for VP1420/VP1421 Presentation Matrix Switches. Led lights, Engraved buttonThe VPK104 is a 4 button contact closure remote pad designed for use with VP1420 VP1421 Presentation Matrix Switch. By connecting the contact closure ports between the remote pad and a presentation switch, the VPK104 provides a convenient interface to switch the input sources for a video presentation switch from a wall mounted faceplate. The VPK104 is an easy and affordable solution, perfect to serve as the control interface in a meeting room, class