The USB2VGA2 USB VGA Adapter turns an available USB 2.0 port into an external video card VGA port - providing high quality dual-display or multi-monitor capability that can be used in a variety of laptop or desktop applications to increase your productivity. The device also offers the option of running up to five additional displays simultaneously (using five USB2VGA2 Multi Monitor External Video Cards). Each connected adapter can be used to further extend the desktop or mirror the image shown on the existing display - all without having to open the computer case to install an additional video card. Backed by a StarTech.com 2-year warranty and free lifetime technical support.