- Bluetooth 5.1 Receiver and 3.5mm AUX adapter that adds wireless audio to any device with a 3.5mm input: car stereo, speaker, amplifier, headset, or other sound devices. - Fits vehicles without built-in Bluetooth, enabling music playback and hands-free calls through the car’s speakers. - Power and pairing: powered by a DC USB adapter; Bluetooth name YP04. Pairing mode shows a rapid green LED flash; connected state shows a slow, steady green flash. - Audio and compatibility: streams audio from your phone or tablet to the 3.5mm output; works with devices that support Bluetooth audio; supports music, calls, and GPS navigation audio. - Auto reconnect: automatically reconnects to your previously paired phone when you re-enter the car. - Use scenarios: - In an older car with no Bluetooth, enjoy music and make calls through the car speakers. - Use at home with a non-Bluetooth speaker or amplifier to play audio from your phone. - While driving, route GPS navigation audio and music through the car stereo. - Key specs: Bluetooth 5.1; 3.5mm AUX output; compatible with any 3.5mm input device; compact receiver.