The bluetooth module is made for Just plug the 18pin connector into the socket back of your radioYou can just Insert this item to the back radio then Connect the red wire to 12V+, the black wire to 12V-.Pair your phone or mp3 or pad with bluetooth to the module, this name: It is bluetooth 4.1 version, not need password when connecting.Choose AUX from your radio and you can from your phone in your car.Match your phone or pad to bluetooth module.and Choose Aux from your radio, then you can use your phone to through car speakers.You can hear music from your phone/pad/mp3(They should have Bluetooth function).Note: Only audio playback, can not be steering wheel control, can not be used answer the phone.18pin Bluetooth fit for following models :For Comand 2.0 ohne TV Tuner oder CD Wechsler.For A-Class (W168) COMAND 2.0 * (10/1999 - 08/2004)For C-Class (W202, W203) COMAND 2.0 * (10/1999 - 03/2004)For CLK class (W208) COMAND 2.0 * (1996 - 09/1999)For CLK-Class (W209) COMAND 2.0 * (10/1999 - 06/2004)For E-Class Saloon (W211) COMAND 2.0 * (10/1999 - 03/2001)For E-Class Estate (W211) COMAND 2.0 * (10/1999 - 03/2002)For G-Class (W461) COMAND 2.0 * (10/1996 - 10/1999)For G-Class (W463) COMAND 2.0 * (10/1999 - 2006)For M-Class (W163) COMAND 2.0 * (1996 - 02/2001)For M-Class (W164) COMAND 2.0 * (03/2001 - 09/2005)For SL-Class (R129) COMAND 2.0 * (1996 - 12/2003)For -Class (R170) COMAND 2.0 * (10/1999 - 02/2004)For COMAND 220Colour: blackMaterial: plasticPackage Contents:1 x AUX Bluetooth CableOnly 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 t. The measurement allowed error is +/- 1-3cm.