The JUA210 Usb 2.0 Display Adapter acts as an external graphics card for your Mac or Pc. It allows you to add an additional Vga display through your Usb 2.0 port. There s no need to open your computer to add an expensive graphics card. With this adapter, you simply load the drivers, plug the adapter into the Usb port, plug the Vga monitor cable into the adapter and you are ready to go.