The PNY Mini DisplayPort to DVI Adapter lets you connect a standard DVI monitor or projector, to a MacBook, MacBook Pro, or MacBook Air via its Mini DisplayPort. The new MacBook, MacBook Pro, and MacBook Air laptops all feature a Mini DisplayPort port that allows you to connect an external display or projector using this adapter. You can use an external display as your main workspace or to extend your desktop. Connecting via the adapter will also allow you to work in mirrored mode with a projector so you can view on your screen what your audience sees.