Kensington Universal USB 3.0 Multi-Display Adapter

Connect additional monitors to your laptop or Ultra book via USB
USB 3.0 ensures fast streaming and superb picture quality - 10x faster than standard USB connections
Universally compatible with any brand or model of laptop or Ultra book with USB port. Works with any Windows-based Computer, and supports MAC OSX from V10.6 (Leopard) right up to the latest Mountain Lion releases (see Displaylink for more details)
Superior high-definition graphics supporting resolutions up to 2048 x 1152
Supports connection to monitors, projectors and HDTV screens
Included DVI-VGA adapter for better flexibility
Powered off the USB port of laptop, therefore no external power needed