RedRay Upgraded FM Car Transmitter,Bluetooth Car Adapter with Dual USB Fast Charging Port,Universal Car Charger Radio Audio MP3 Player Car Charger Support Hands-free Calling, USB Drive, SD Card,ELECTRIC 3 Playing Modes with Broad Compatibility : Play music from Bluetooth connection, TF card, USB disk; Support A2DP and MP3/WMA/FLAC/AAC/WAV format music. Noise-Cancelling: Built-in noise-cancelling microphone provides clear and high quality sound when making a phone call. Easy To Use; Insert the bluetooth transmitter into the car cigarette lighter, adjust the car radio to a blank FM frequency (87.5-108.0 MHz), then adjust the FM transmitter to the same frequency, and then connect your phone to the transmitter via Bluetooth to enjoy lossless music. The FM bluetooth transmitter will automatically connect to your phone when it is turned on for the second time.