AUX IN amplifier for E53 with Bluetooth and noise filter1、Applicable Model: The bluetooth adapter is a replacement for E46 320i, 320ci, 320cic, 323i, 323ci, 323cic, 325i, 325ci, 325cic, 328i, 328ci, 328cic, 330i, 330ci, 330cic 2002‑2006. 2、Function: With this AUX IN Bluetooth adapter, you have the ability to stream music from your external device, such as your smartphone or tablet, via the car stereo. 3、Unique Design: The bluetooth adapter is designed with an integrated amplifier and a noise filter, avoided overload and associated interruption of the connection. 4、Features: Audio HD transmission through the original car AUX signal, Bluetooth version 5.0, support T card, U disk, Bluetooth wireless audio, AUX input, microphone, hands free calling. 5、Easy Installation: Thanks to the simple plug and play installation, you can get started immediately via the Bluetooth connection.