market potential : MP3 players are popular nowadays This product will surely be popular and hot Function :transferring MP3 frequency into the FM Radion electric wave ; Instruction: Plug it into the cigarette Lighter on your car. And then insert the other end into the earphone port. adjust the FM Radio to 107.7MHz. Advantage:dont need to buy many CDs. and you can listen as many songs as you like. and all people can enjoy the music together and not affect driving. Approvals : CE and FCC approval available