The Tripp Lite CS-84 4-Port External KVM Switch PS/2 UNIT ONLY is a device that allows you to connect multiple PS/2 devices to a single PS/2 port on your computer. It is a unit-type KVM switch box that is compatible with PS/2 models. The switch features four ports and is made by the brand Tripp-Lite. It is suitable for use in computers, tablets, and networking applications.