Car Bluetooth Adapter AUX-IN Audio Microphone Handsfree MIC For Citroen C3 2005 + Blaupunkt/VDO/Bosch RD4 - AliExpress
Amazon.com: Bluetooth Wireless Wire Harness, Car Bluetooth 5.0 Audio Wireless Wire Harness Handsfree Microphone Replacement for C2 C3 C4 C6 for Bosch RD4 : Electronics
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BOSCH CM RD4 N1 MP3 03 9666959577 radio cd module 7641110110 | eBay