The Bluetooth module is designed for Z4. Simply plug the 16-pin connector into the socket on the back of the radio. You can plug this into the rear radio, then connect the red wire to 12V+ and the black wire to 12V-. Match your mobile phone or to the Bluetooth module, then select Aux from the radio, and then you can use the mobile phone to play music through the car speakers. You can listen to music from your phone//mp3 (they should have Bluetooth capabilities). Fitment: For (E60): 5 Series: 525i, 525it, 528i, 528it, 530i, 530it, 540i, 540iT & M5 (Sedan and Touring) 2004-2010 For (E63) (E64): 6 Series: 630Ci, 630i, 645ci, 650i, M6 (Coupe and Cabriolet/Convertible) 2003-2010 For (E65) (E66): 735i, 735li, 740i, 740li, 745i, 745li, 750i, 750li, 760i, 760li (and crude oil engine) 2002-2008 Suitable for M-ASK, ASK-CD Suitable for 1er Serie (E87, E88, E81, E82), Serie 3 (E90-E91-E92) Suitable for 2004-2010 Specifications: Voltage input: 5V-12V DC Working current: 600mA Standby current: 20mA DAC resolution: 20bit harmonic distortion: 0.05% Signal to noise ratio: 90dB Frequency response: 20HZ-20KHZ Working temperature: -35 to +75 Note: with microphone colour: black Material: plastic + electronic components Package Contents: 1 x Bluetooth adapter 1 x microphone 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.