This product has FM Transmitter Bluetooth Bluetooth Handsfree MP3 Car USB Charger Card Recognition Audio Output of Integrated Function. this is a high-end Bluetooth handsfree transmitter, car FM transmitter, he uses a professional high performance Bluetooth module, built-in MP3 / WMA decoder chip, U disk or tf card in the music file wireless transmission to car audio, but also via the AUX hole input the car radio. And, as long as your phone with Bluetooth, you can transfer your phone music to your car radio, call can switch to handsfree, call ends, it automatically goes to the music player. Features: FM FM Transmitter Indicator display window Stand-alone Bluetooth on off button line audio input support using U disk to music support MP3 / wma can answer / hang / reject / redial a key through the Bluetooth handsfree Bluetooth stereo music player, fired via fm to car radio. Call echo and noise reduction (CVC) technology USB output voltage, can provide voltage to other devices up to 5 V / 2.5A automatic power failure frequency memory function On-board battery power display Car Bluetooth FM Transmitter: The phone, U disk, TF card, MP3 music inside the car to play audio car charging: USB interface, mobile phone / iPad smart charging. Bluetooth handsfree: The phone can call a Bluetooth handsfree key. Car USB: You can read through the USB interface, U disk, or card slot to read tf card car mp3 bluetooth player