Amazon.com: Bluetooth Car Kit for Audi,Compatible with Audi 2006-2017,Wireless Music Audio Aux AMI MMI Adapter,Premium Chipset Quality Sound,Works with Apple Android Devices : Electronics
PAM8403 Bluetooth 4.0 Receiver Board Stereo Digital Audio Amplifier USB CSR8635 | eBay
BTM835 CSR8635 STEREO BLUETOOTH 4.1 AUDIO MODULE ON BOARD ANTENNA