The Comprehensive USB2-DVI/VGA/HD USB 2.0 Graphic Adapter allows you to connect an extra monitor to your desktop PC or laptop's USB port. The connected monitor can be configured to either clone your primary screen, or extend the Windows desktop allowing visibility of more applications at the same time.The USB 2.0 Graphic Adapter driver used to control the extra screen uses very little computer resource and offers a vast array of screen resolutions and color depths. This ensures that there is little difference in performance between a directly connected screen and a screen connected through the USB 2.0 Graphic Adapter. The USB 2.0 Graphic Adapter supports up to six simultaneous displays, including widescreen displays, extending your desktop and your horizons. (One USB2-DVI/VGA/HD adapter per display) It operates at a high resolution of 1920x1200 / 2048x1152. Unit comes with DVI to HDMI and DVI to VGA adapters. Unit is covered by our 2 year warranty.