This device is a bluetooth MP3 Player developed for in car used, it equip with professional high-performance bluetooth module and MP3 decoder chip.
It can play and transmit the music from TF card to car stereo via FM radio signal.
It can transmit the music from your mobile to car stereo via bluetooth.
It can be used as a hands-free car kit during the driving via bluetooth.
This device transmit signal by wireless method, no need to modify anything in car. It can be used both as the music player in entertainment purpose or hands-free car jut for the safety driving