1Output audio from electronic audio device to connect to car audio system to listen to music on these devices. 2When you need other audio output or input, it will be of great help to you. 3High sensitivity connector ports can achieve good transmission performance. 4Compact and lightweight structure, easy to use. 5Perfect 3.5mm AUX adapter cable.1 x AUX Cable1 x 3.5mm Male to Male CableItem Type: Car AUX Input Adapter CableCable Length: 1.5mPlug Diameter: 3.5mmApplicable Car Model:For 5 series (E39 with SA 661-650)For 5 series (E60, E61)For 6 series (E63, E64)For Z4 series (E85 with SA 662)For X3 series (E83 with SA 662)For X5 series (E53 with SA 661-650)Only In Connection With:SA 650 (Radio Business with CD drive)SA 661 (Radio Business with CD drive)SA 662 (Radio Business) 1Output audio from electronic audio device to connect to car audio system to listen to music on these devices. 2When you need other audio output or input, it will be of great help to you. 3High sensitivity connector ports can achieve good transmission performance. 4Compact and lightweight structure, easy to use. 5Perfect 3.5mm AUX adapter cable.1 x AUX Cable1 x 3.5mm Male to Male Cable