FM Transmitter Handsfree Bluetooth for Car Radio Transmitter Mp3 Player with Dual USB(BT66) Handsfree calling is available when your cell phones being connected with this bluetooth car kit.You can playing music by car audio system through this car bluetooth This bluetooth fm transmitter has two usb port,two cell phones mp3 ipod or other devices can be charged at the same time. SD card music playing is supported by this car fm radio transmitter also this stuff can play music in U-disk,you can enjoy music conveniently. 3.5mm Aux input is available for this wireless fm transmitter,which can supply stable transmission. This bluetooth fm transmitter support remote control, it can be controlled by a 21key remote controller easily, which is more convenient than the stuff without controller.