Full Details on Amazon.com : http://www.amazon.com/gp/product/B0000512VR?tag=tsukuyomi-20

Iogear GSC104U 4-Port USB KVM Switch Kit for PC/Mac

Share a monitor USB keyboard USB mouse and 2 more USB devices among 4 computers
Works with Macs PCs and other USB-compliant computers
Plug and play monitor support
Supports video resolutions up to 1920 x 1440
Operating system-independent with no software required