B004-2DUA4-K - 

4-Port Dual Display DVI KVM Switch with Audio and USB 2.0 Hub, Cables included
Supports both Dual Link digital video resolutions up to 2560 x 1600, and analog resolutions up to 2048 x 1536
Switch between connected computers via front panel pushbuttons, keyboard hotkeys, and a function that allows for switching via your mouse's scroll wheel

Built-in 2-Port USB 2.0 hub allows for the sharing of USB devices (flash drives, web cams, powered USB hub, etc.) amongst the connected computers

Features:

3.5 mm Mini Stereo jacks provide Speaker (2.1 stereo sound) and Microphone support to the connected computers

Quad-View Mode allows for computers with three- or four-head video cards to share KVM, audio and USB peripherals by connecting two Dual Display/Monitor KVM switches together

Quick installation without the need for software

Compatible with all major operating systems; Windows, Mac, Linux, Sun

Compliant with the Federal Trade Agreements Act (TAA) for GSA Schedule purchases