Product Details Ⅰ. Wirelessly stream music, navigation announcements and YouTube audio in your vehicle via Bluetooth connection Ⅱ. Control playback directly from your car radio or steering wheel for convenient operation Ⅲ. Automatically starts playing when radio is selected and stops when switching to other modes like radio Ⅳ. Features integrated amplifier for enhanced audio quality during playback Ⅴ. Bluetooth 5.0 support ensures low power consumption for extended use Ⅵ. Built-in antenna provides stable connection throughout the vehicle Ⅶ. Minimal installation effort with invisible connection to the back of the radio Ⅷ. No additional wiring needed for power supply, simple setup process Ⅸ. Automatically recognized as a CD changer by the radio, no coding required Specification Ⅰ. Compatible with BMW E46, E39, E38 Business BM24 Rundpin models Ⅱ. Compatible with stem with 4:3 on-board monitor in trunk near radio module Ⅲ. Dimensions: 3cm Ⅳ. Colour: Black Ⅴ. Bluetooth version: 5.0 Package List Ⅰ. 1*Music Adapter Warm Tips Ⅰ. Telephony function is not supported by this adapter Ⅱ. For telephony use, please select an adapter with microphone Ⅲ. Developed in Germany for reliable performance