1Advanced Technology: Bluetooth 4.0 HiFi lossless Aux transmission technology provides lower power consumption and wider compatibility. It makes you can enjoy music via your mobile phone. 2Convenient Installation: Installed via original Cd changer port, easy and fast. After it is paired with your phone or media socket first time, it will automatically reconnects every time when you enter the vehicle. 3Safety Improvement: Car bluetooth wireless connection makes it convenient for your phone to connect car speakers. Do not worry about safety when you listening to music or selecting songs on your traveling. 4Wide Compatibility: Bluetooth 4.0 version, and compatible with 2.0 3.0 4.0 other versions of Bluetooth, can support the commonly used MP3 format audio. 5Fitment: This car bluetooth wireless connection is compatible with Rns?E Radio, replacement for A3; Replacement for A4; Replacement for A6; Replacement for Tt; Replacement for R8; Replacement for Seat Exeo; Replacement for Gallardo; Fit for vehicles with factory fitted Ami interface.