The Apple Micro-DVI to DVI adapter was designed specifically to fit the slim profile of MacBook Air. Connect the adapter to the Micro-DVI port of your MacBook Air and the DVI end of the adapter to an external DVI monitor or projector. You can use this cable in both video mirroring and extended desktop modes. Apple Micro-DVI to DVI Adaptor Allows you to connect to an external VGA monitor or projector It can also be used in combination with the Apple DVI to ADC adapter to support older Apple flat panel Studio or Cinema Displays