Use the car's auxiliary signal for HD audio transmission. Function via bluetooth devices;Without functional limitations of the car radio.It allows you to connect an external audio source. With the improvement of wireless technology and subsequent wireless transmission is the trend of the times, a wireless bluetooth music product suitable for car use.Support TWS (receive mode) AC6925A bluetooth stereo chip.Integrated intelligent noise reduction technology to reduce noise. The main bluetooth control chip is used to reserve the auxiliary audio input function through the original car. The bluetooth car music player has wireless music streaming function, for old and current car audio, because many consumers find listening to music very difficult. If there is no audio input port, you have to burn the disc and the movie's sound source updates slowly, which is inconvenient. In many stereo years, the car has reserved external AUX input function, this product can open and use the online music playback support function In the streaming media era, various online applications are quite convenient, and the sound source is updated in time. Installation: Red power cable connected to 12V + Black power cable connected to 12V- Connect it to the CD player connector (confirm the corresponding plug), the mobile phone is connected with the bluetooth module, auxiliary audio source selection, you can play music from mobile phone. Specification Name: Audio Cable adapter Transmitter distance: 15m Frequency response: 20Hz-20KHz Frequency range: 2.402-2.480 GHz Distortion rate: 1% Current: 20 mAh Bluetooth name: jieri-bt 5708 (compatible with T U disk pluggable-bluetooth wireless audio auxiliary input microphone Telephone hands-free) Bluetooth Version:5.0 Product Voltage: 12V Applicable Models: For (E60): 5-Series: 525i ... 525it ... 528i ... 528it ... 530i ... 530it ... 540i ... 540iT and M5 (for sedan and touring) 2004- 2010 For (E63) (E64): 6-Series: 630Ci ... 630i ... 645ci ... 650i ... M6 for Coupe and Cabriolet / de) 2004-2010 For (E65) (E66): 735i, 735li, 740i, 740li, 745i, 745li, 750i, 750li, 750li, 760i (and for crude oil) 2002-2008 For M-ASK, ASK-CD and For 1er Series (E87 ... E88 ... E81 ... E82) For Series 3 (E90-E91-E92) Colour:Black Material:plastic Package Contents: 1 x Audio Cable Adapter 1 x bluetooth microphone 1 x User Manual 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.