Belively Wireless Bluetooth Fm Transmitter Modulator Radio Adapter Car Kit Music Player  Music Control and Hands-free Call with USB Car Charger (Black 03) This device is a bluetooth MP3 player developed for car-used,which equipped with professional high-performance Bluetooth module and MPS decoder chip. It can play and transmit the music from TF card to car stereo via FM radio signal. It can transmit your mobile phone's music to car stereo via Bluetooth. It can also be used as a hand-free car kit during driving. This device transmits signal by wireledd method,no need to modify anything in car.It can be used both as the music player in entertainment purpose or hand-freee car kit in safety purpose during driving.