Feature: 1. Bluetooth 5.0 version, backward compatible with Bluetooth protocol of 2.0 3.0 4.0 version. 2. Function via Bluetooth‑enabled devices, no functional limitations of the car radio, dependable to use. 3. Allows to connect an external audio source, and you can enjoy music from your phone through car speakers. 4. Support common MP3 format audio, supports WMA, WAV, FLAC and other high‑quality audio format decoding. Support DSD large‑capacity transmission. 5. Simple to use, just insert this adapter to the back radio, then connect the red wire to 12V+, the black wire to 12V‑. 6. Match your phone or pad to bluetooth module, and choose Aux from your radio, then you can use your phone to play music through car speakers. Specification: Item Type: RCA Bluetooth Adapter Material: ABS Wiring: The red wire is connected to the positive pole The black wire is connected to the negative pole The RCA head connects to CD radio signal interface. Compatible: For Kenwood radio For Clarion radio. Package List: 1 x RCA Bluetooth Adapter