silver 2.1A car charger with Bluetooth transmitter Function AZ19883 Feature:***** It has the comprehensive functions of fm transmitter, car Bluetooth hands-free, car MP3, car USB charger, and card recognition.***** Using professional high-performance Bluetooth module, built-in MP3/WMA decoding chip, can save music files in U disk or TF cardWireless transmission to the car stereo.***** And, as long as your phone is equipped with Bluetooth, you can transmit the music in your phone to your car stereo. The incoming call can be switched to the hands-free state, and when the call is over, it will automatically switch to music playback.***** fm transmitter: transfer music in mobile phone, U disk, TF card, MP3 to car audio for playback.***** Car charging: You can charge your mobile phone/iPad smartly through the USB interface.***** Bluetooth car hands-free: The mobile phone can make a one-key hands-free call via Bluetooth.*****Car USB: U disk can be read through USB interface, or TF card can be read from card slot.