Mini Display Port VGA Adapter for Mac
Every Mac with a Mini Display Port allows you to 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 DisplayPort to VGA Adapter to connect your Mac to a standard analog monitor, projector, or LCD that uses a VGA connector or cable.
connection: MiniDisplay Port to VGA