This product is designed for car audio systems with RCA input. Simply connect the power wires to the vehicle's battery, plug the RCA cables into the car radio, and pair your phone via Bluetooth. Connect the red wire to 12V+ and the black wire to 12V–, then insert the unit into the back of the radio. Select AUX on your car radio to play music from your phone through the car speakers. The Bluetooth module supports quick auto-pairing and is compatible with smartphones, tablets, and other Bluetooth-enabled devices. Key Features: - Plug and Play - Includes 2 RCA connectors - Bluetooth Version 5.0 - Wireless range up to 10 meters - Auto-pairing setup in minutes - Compatible with existing CD changer systems - Works with Bluetooth-enabled devices - Fits most vehicles with RCA input - Universal fit for most car models - Color: Black - Material: ABS Package Contents: 1 x Bluetooth Adapter Cable Installation Instructions: 1. Connect the red wire to 12V ignition power 2. Connect the black wire to ground or metal chassis 3. Connect RCA plugs to the RCA inputs on the source device 4. Pair your phone with the Bluetooth module 5. Ready to use Note: Light reflection and display settings may cause slight color variations between the product image and the actual item. Measurement may vary by ±1–3 cm.