LOTOS luetooth Music Adapter 4.0 Cable AMi Interface for Audi A3 A4 A5 A6 S5 A6 A8 Q7 As long as the mobile phone with bluetooth can link to audi stereo. Bluetooth mode, after the success of the cell phones and bluetooth pairing, can choose music playback in phone, in the meantime can play the car stereo. U disk mode, as long as there is song files, u disk inserted in the line of usb interface, the car stereo can play. This product is suitable for the vehicle production after paragraph 09 only bluetooth audio playback, Applicable models: (The car must be late than 2009 years) Audi Series: A6L / Q5 / Q7 / A8 / S5 / A5 / A4L / A3 / A1 (original car with AMI interface).