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StarTech.com USB to VGA Adapter - External USB Video Graphics Card for PC and Mac - 1920 x

The graphics adapter supports high-performance requirements and high resolution video making it suitable for connecting large-screen monitors
USB-powered operation eliminates the need for an external power adapter enabling you to position an additional monitor without having to make the extra power connection or carry an additional cable for mobile applications
Completely external device offers a simple upgrade solution saving the cost and hassle of upgrading the internal video card on your system which in many cases would void manufacturers warranties
Optimal performance at 1920x1200 and ideal for use with 24 to 26 monitors or smaller
Support for Aero themes in Windows
Works with Mac OS X