Blue Tooth Car Adapter Key benefits Hands calls with a built in microphone and speakerphone. Answer or reject calls with a touch of a button while keeping both hands on the wheel. Converts any car stereo into a Bluetooth speaker. Uses FM transmission to broadcast from 87.5 to 108 MHz, enabling wireless music streaming through the car's audio system. Clear, reliable calls and music thanks to Bluetooth 5.3. Faster pairing, improved stability, and reduced mic and audio dropouts for a smoother experience. What it does Function: Turns a non Bluetooth car stereo into a Bluetooth capable audio system by transmitting audio over an FM channel to your car radio. Compatibility: Works with any car stereo that can receive an FM signal within the 87.5 108 MHz range. Performance: Bluetooth 5.3 provides faster transfer speeds and clearer sound for both music streaming and hands calls. Control: Built in microphone and speakerphone enable clear calls, with on device controls to answer or reject calls without looking away from the road. Use scenarios Daily commute in a car without Bluetooth: pair your phone, stream music through the car radio, and handle calls safely with the built in microphone and button controls. Long road trips: enjoy uninterrupted music from your smartphone while maintaining hands calling for passenger calls or navigation prompts. Shared or rental cars: quickly connect to the car's FM radio to use Bluetooth audio without needing a dedicated car stereo upgrade. Notes Frequency tuning: Easily select any FM frequency from 87.5 to 108 MHz to align with your car radio's available stations. Safety and convenience: Designed to minimize driver distraction by centralizing music playback and call controls on the device.