Function: 1. A replacement option for RNS 310, RCD 310, and similar models to meet your needs effectively. 2. Pair your device via Bluetooth and select AUX on the radio to play music through the car speakers. 3. Listen to music from your Bluetooth device and make hands-free calls using Bluetooth 5.0 for clear audio and a stable connection. 4. Features Bluetooth 5.0 protocol, backward compatible with Bluetooth 2.0, 3.0, and 4.0. Easy to use, plug-and-play design. 5. Supports common audio formats including MP3, WMA, WAV, and FLAC for high-quality sound decoding. 6. Supports DSD high-resolution audio transmission with stable data transfer and high fidelity, ideal for music lovers. Specification: Item Type: Microphone Adapter Material: ABS Voltage: DC12V Bluetooth: Bluetooth 5.0 Microphone Cable Length: Approx. 150 cm / 59 in (manual measurement may vary) Installation: Compatible with: - RNS 510 - RNS 310 - RCD 300 - RCD 310 - RCD 510 Package List: 1 x Car Microphone 1 x Bluetooth AUX Adapter Note: When using for the first time, a diagnostic tool may be required for activation. Locate the socket in the vehicle (typically on the back of the radio), install directly, and connect the power cord. Turn on the device; the Bluetooth indicator will flash. Enable Bluetooth on your phone and complete pairing. Once connected, activate the AUX input on the head unit to play audio through the car speakers.