The JUA365 USB 3.0 to Dual HDMI Multi-Monitor Adapter acts as an external video card for your Mac or PC. It allows you to add an additional monitor/display through your USB 3.0 port. With the USB 3.0 to Dual HDMI Multi-Monitor Adapter you simply load the drivers, plug the adapter into the USB port, then plug in the HDMI monitor cable into the adapter and you are ready.