Tripp Lite's B004-2DUA4-K 4-Port Dual Monitor KVM switch allows for the control of four computers with Dual Head DVI video cards via a single set of keyboard, mouse, and dual displays. Built-in USB 2.0 and 3.5 mm. Mini Stereo ports provide added functionality, allowing you to share USB peripherals (flash drive, web cam, powered USB hub, etc.), Speakers (2.1 stereo sound), and Microphone amongst the connected computers. Switch between the connected computers using the front panel pushbuttons, keyboard hotkey commands, or a function that allows for switching via the scroll wheel on your mouse. Switch the KVM, USB, and Audio functionality all at the same time, or separately. KVM control can be fixed on one computer, while the USB 2.0 hub and/or Audio functionality is fixed on another. And set-up is quick and simple, with no software to install, and KVM cables included, so you're ready to go right out of the box.