StarTech.com USB VGA External Dual or Multi Monitor Video Adapter - High Resolution Video Card USB2VGA2 Compact, USB powered adapter provides the easiest way add a secondary or additional display to your PC Completely external device offers a simple upgrade solution saving the cost and hassle of upgrading the internal video card on your system The ability to use multiple adapters (up to five) provides a scalable display configuration for future expansion Optimal performance at 1680x1050 and ideal for use with 20" to 22" monitors or smaller Easy installation No power adapter required