The D-Link DKVM-4K is a 4-port PS/2 based KVM switch for controlling up to 4 computers using a single monitor, keyboard, and mouse. The DKVM-4K minimizes clutter on your desktop with its sleek, compact design. Ready to work right out of the box, the DKVM-4K requires no drivers, extra power supplies, or accessories and is compatible with all Windows Operating Systems. 4 x 1 - 4 x mini-DIN (PS/2) Keyboard, 4 x mini-DIN (PS/2) Mouse, 4 x HD-15 Video Desktop