USB™ 3.0 VGA Slim Display AdapterThe JUA315 USB 3. 0 VGA Slim Display Adapter acts as an external video card for your Mac or PC. It allows you to add an additional VGA monitor display through your USB 3. 0 port. There is no need to open your computer to add an expensive video card. With the JUA315 you can simply load the drivers, plug in the adapter to the USB port, then plug the VGA monitor cable into the adapter and you are ready. The adapter supports three viewing modes. Primary