1.The adapter cable allows you to connect a video signal to a navigation system with video input on Fakra socket. Adapter is suitable for connecting video accessories such as rear camera, DVD, VCR, DVBT tuner, etc. 2.Fakra connector of the adapter cable is connected to the navigation system. Video can now be connected to the RCA. Anticipation is to examine in each case whether the Navi has a connection for the rear camera. 3.It is a green Fakra connector on the back. To my , the Navis this connection as standard (even if the car has no camera). Instructions for use: Fakra socket green available for video input on the car Video camera is activated via diagnostic system No other video sources such as TV tuner or the like are connected to the device Compatibility : For Comand PCM 2.1 / PCM 3.0 / NTG2.5 / NTG4 For Blau- NX Werksradios ab . 10.2009 Material:plastic shell colour:Black + Blue + Yellow Package Contents: 1 * Video Cable Adapter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.