Eximtrade Mercedes Media Inerface MMI to Bluetooth CSR Chipset USB Flash Charger MP3 Music Cable for Mercedes Benz Bluetooth Music Streaming for Mercedes Media Interface. Activate the AUX mode in the MMI system and connect your smartphone with this bluetooth cable, then you can listen music via the car stereo. The bluetooth cable will automatically connect to your smartphone when the car is started. Simultaneous connection with two smartphones is supported. Press the button to change between the USB mode and the bluetooth mode. Insert the charging cable into the USB port for charging, or insert USB flash stick for music. Bulit-in premium CSR chipset, high quality audio transmission is guaranteed. Please note that you can only change songs from the smartphone, no control over music from the MMI system. The playlist will not be displayed on the screen.