Features: 1.Fitment: Bluetooth music adapter is replacement for A3 A4 A5 A6 A7 S3 S4 Q3 Q5 Q7, perfect matching your car. 2.Function: When the car is start, audio aux adapter will automatically connect to the last paired device, more practical. 3.Noise Reduction: Built in noise reduction circuit provides excellent sound quality, clarity and no noise, stable and reliable. 4.High Quality Material: Audio cable is made of high quality ABS and copper material, wear resistant, high toughness and durable. 5.Easy Installation: Easy to install, just plug and play, lightweight and portable, convenient for using, save your time and energy. Specification: Item Type: Audio AUX Adapter Material: ABS+Copper Color: Black Operating Voltage: DC5V Operating Current: 25-50mA Bluetooth Version: 5.0 Interface Type: AMI/MDI Fitment: Replacement for A3 A4 A5 A6 A7 S3 S4 Q3 Q5 Q7 Note: Only replacement for MMI 2G multimedia system stereo host. Only replacement for car models pre?2011 and equipped with MDI interface.