Use an available USB port to expand your computer's video capabilities. This adapter creates a secondary VGA connection for dual monitor functionality. Simply plug the adapter's USB cable into a computer, and using a VGA cable, connect the adapter's VGA connector to a second monitor. Now you have dual monitor capabilities without buying a new computer or installing an internal video card. Not only is the adapter simple and cost-effective, it's also bus-powered so an external power cord is not required. Its compact size also makes it portable so you can use it anywhere.