Features: The Bluetooth main control chip is used to reserve the AUX audio input function through the original car. The car Bluetooth music player has wireless music transmission function, for the old and current car audio, because many consumers find that listening to music is very troublesome. If there is no audio input port, you need to burn the disc, and the disc The sound source of the film is slow to update, which is inconvenient.In many old stereos, the original car has reserved AUX external input function, so this Product can open and use the hidden function to support online music playback. In the streaming media era, Online various APPs are quite convenient, and the sound source is updated in time.Function via Bluetooth-enabled devices.No functional limitations of the car radio.Allows you to connect an external audio source. With the improvement of wireless technology and the subsequent wireless transmission is the trend of the times, a wireless Bluetooth music product suitable for car use.Bluetooth version: 5.0;Product voltage: 12VInstallation:Red power cable connected to 12V+,Black power cable connected to 12V-, Plug into the CD player Jack (please confirm corresponding socket), mobile phone is connected with the Bluetooth module, aux audio source selection, you can play mobile phone music.Fit ForFor Citroen C2 2005 +For Blaupunkt/VDO/Bosch RD4.C3 2005 +For Blaupunkt/VDO/Bosch RD4 C4 2005 +For Blaupunkt/VDO/Bosch RD4 C5 2004 +For Blaupunkt/VDO/Bosch RD4.C6 2005 +For Blaupunkt/VDO/Bosch RD4.Citroen C8 2004 +For Blaupunkt/VDO/Bosch RD4.Citroen Berlingo 2005 +For Blaupunkt/VDO/Bosch RD4.Citroen Jumpy 2007 +For Blaupunkt/VDO/Bosch RD4.Citroen Synergie 2005 +For Blaupunkt/VDO/Bosch RD4.Peugeot Expert 2007 +For Blaupunkt/VDO/Bosch RD4.Peugeot 207 2006 +For Blaupunkt/VDO/Bosch RD4.Peugeot 307 2005 +For Blaupunkt/VDO/Bosch RD4.Peugeot 307SW 2005 +For