Function via Bluetooth-enabled devices, No functional limitations of the car radio.Allows you to connect an external audio source The Product is specially made according to the car port, a wireless Bluetooth music product suitable for car use. Adopt Bluetooth 5.0 protocol, backward compatible with 2.0 3.0 4.0 other versions of Bluetooth protocol, can support common MP3 format audio, also support for WMA, for WAV, for FLAC, and other high-quality audio format decoding, non-general ordinary Bluetooth function, can support DSD Large-capacity transmission, stable data transfer between devices, fidelity, designed for music enthusiasts. Installation: The adapter is connected invisibly to the back of the radio No additional necessary for the power supply It is automatically recognized by the radio as a CD changer, No aux input must be unlocked consuming. Fitment: For A3 TT A4 S4 A6 A8 A8L 2007-2014 Colour:black Material:ABS Package Contents: 1 * Audio Cable Adapter 1 * Bluetooth microphone 1 * Disassembly tool Only 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.