Tripp Lite 4-Port Dual Monitor DVI KVM Switch with Audio, USB 2.0 Hub & Cables (B004-2DUA4-K) 4-Port Dual Display DVI KVM switch with Audio and USB 2.0 Hub, Cables included Quad-View Mode allows computers with three- or four-head video cards to share KVM, audio and USB peripherals by connecting two Dual Display KVM switches together Built-in 2-Port USB 2.0 hub allows for the sharing of USB devices (flash drives, printer, etc.) amongst the connected computers A powered USB hub may be connected to one of the USB ports to increase the number of connected peripherals 3.5 mm Mini Stereo jacks provide Speaker (2.1 stereo sound) and Microphone support to the connected computers Additional console audio jacks are conveniently located on the front panel of the KVM switch, making them ideal for use with IP phones Switch between connected computers via front panel pushbuttons, keyboard hotkeys, and a function that allows for switching via your mouse's scroll wheel 3-year limited warranty