The Accessory V6-AVRG5B1 is an accessory to the PMOST2DV6 which allows you to add audio and video sources including iPod/iPhone, gaming consoles, reverse cameras, and even portable DVD players to your factory display screen or R.E.S. (rear seat entertainment). When the V6-AVRG5B1 is installed you will see a source menu which expands to include all connected sources in R.S.E. (rear seat entertainment) mode. These sources can be selected independently from the front source (radio/display screen) or the iDrive.