The USB 3.0 to VGA Display 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 Display Adapter you simply load the drivers, plug in the adapter to the USB port, then plug in the VGA monitor cable into the adapter and you are ready. It supports three viewing modes: Primary Mode allows you to have individual applications open on each monitor, vastly improving productivity; Extended Mode allows you to extend your desktop across multiple displays, great for spreadsheets; and Mirroring Mode is used to clone one screen onto another, ideal for presentations. Between your computer and 2nd monitor or projector, you will be able to create a new visual environment in seconds.