1Bluetooth A2DP Technology: This car bluetooth Fm transmitter can play songs inside the U disk and Tf card through the Bluetooth A2DP technology, and transfer the audio inside the phone and stereo music to the car stereo (1AUSB port to read). 2Music Enjoyment: With Bluetooth hands free function and Dsp cancellation function, this car Fm radio transmitter can play MP3, Wma, Ape, Flav, Wav format music files. And with Fm channel support, the car MP3 wireless Fm transmitter allows you to freely enjoy music. 3Excellent Performance: Dual USB output, and 5V 3.1A USB interface is compatible with smart charging. The maximum 3.1A charging current can be used to charge multiple types of devices in the car, and its wide voltage power supply is 12V?24V, which is suitable for various voltages of car use. 4More Details: The transmission distance is 10 ? 15m, and bluetooth protocol supports Hfp, Hsp, Opp, A2DP, Avrcp and Pbap, the Fm transmission frequency is 87.5 ? 108.0Mhz. 5Durable Construction: Our car bluetooth charger is made from solid and sturdy material with exquisite workmanship, which has high strength and stability, and can be stably used for a long lasting time.