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 view 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 view camera.3.It is a green Fakra connector on the back. To my knowledge, 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 carVideo camera is activated via diagnostic systemNo other video sources such as TV tuner or the like are connected to the deviceCompatibility :For Mercedes Comand PCM 2.1 / PCM 3.0 / NTG2.5 / NTG4For Blau-punkt NX Werksradios . 10.2009Material:plastic shellcolour:Black + Blue + YellowPackage Contents:4 x Video Cable AdapterOnly 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.