There are many monitors with DisplayLink technology built in. USB monitors are the easiest way to add an additional display to your PC or Mac. Simply install the DisplayLink software and plug the USB monitor into your USB port - That's it! Most USB monitors are powered by the USB port, so there is no need for an additonal power lead, making them power efficient and portable. USB monitors let IT departments improve their worker productivity with extra monitors without the cost or time required to add graphics cards to each and every PC.