There are many kinds of Bluetooth FM transmitter, but this one is very special.The Newest Version LED FM Transmitter is an upgrade version from the previous LED FM transmitter.The Fm transmitter adapter has two USB ports, one designed for charging and other one for reading USB files;Its amazing LED display enables you the current voltage of the storage battery of your car, also the caller ID and song files.Work with iPhone (max speed), iPad (max speed), iPod, HTC, Galaxy, Blackberry, MP3 Players, Digital Cameras, PDAs, Mobile Phones. This version utilizes Bluetooth 3.0 technology, equips with two USB ports,one designed for charging and other one for play USB music file.This version fm transmitter provides multi-solutions for your hands-free driving and in-car stereo streaming.Smartphones could be connected to this fm transmitter through Bluetooth,and then streamed through car fm system or AUX port.Smartphones or Mp3 players could also be connected to this fm transmitter through AUX-in port of device,and then streamed to the car stereo speaker through FM.Easy pairing with Bluetooth stereo headset, headphones, speakers and other