The Mac Book, Mac Book Pro, & Mac Book Air each have a Mini Display Port that means that you can connect an external display or projector using an adapter. You can use an external display as your main workspace or to extend your desktop, or you can work in mirrored mode with a projector so you can view what your audience sees. Use the Mini Display Port to Dual-Link DVI Adapter to connect your Mac Book, Mac Book Pro, or Mac Book Air to a 30-inch display, such as the 30-inch Apple Cinema Display HD, & enjoy the ultimate widescreen canvas with a resolution of 2560 by 1600 pixels.