The Gefen ADA-MDP-2-DVI Mini-Display Port to DVI Adapter allows you to extend your desktop or laptop to a projector, or simply enjoy a larger main display. Locate the Mini DisplayPort connector on your laptop. Firmly insert the Gefen Mini-DisplayPort to DVI Adapter, mini connector side facing the laptop. Attach your DVI-D compliant monitor's input cable to the larger side of the Adapter containing the full-size DVI-D connector. Power on your external monitor/projector/HDTV. You should see a beautiful, sharp image.