Use Instruction（Compatible with Mercedes-Benz car Only）: put the plug into the MMI port (Ｖery Important: please confirm your car have MMI Interface like picture show, it is a rectangular socket hole, not is a ipod pin plug or HIM port) then activate the AUX mode in the MMI system of your vehicle and pair it with your Android, iPhone, iPad or iPod touch via Bluetooth to play music (Note: MMI socket usually in the glove box) | 5.0 Bluetooth Version with handle free function | Purchase Notes: this bluetooth adapter ①does not support simultaneous charging via USB and streaming of music. ②does not with volume control unit button. ③dose not support change songs from the iDrive system/ steering wheel. ④the playlist will not be displayed on the car screen ⑤a little part cell phone need update a new soft version to compatibility this adapter (Audio was modification may be will not work with this adapter) | Vehicle Compatibility with: Compatible with Mercedes-Benz A-Class W169 C169;B-Class W246 W245;C-Class W204 S204 C204;E-Class A207 S212 V212 W212 W211;S-Class C207;M-Class W166;G-Class G463;CLS- Class C218 C219;GLK-Class X204;SL-Class R230;SLK-Class R171 C639 NCV2 Vito.( Note: The detail compatibility of Month/Year please check:Product description; Not fit 2009 before model of C300/ E320/ E350 with iPod iPhone 30 Pin plug connecter and HIM interface) | Feature: bluetooth kit have auto connect recorded.(this bluetooth adapter Sound stable and the Transmission quality will better than other FM channel bluetooth transmission product)