ATC LCD STEREO CAR FM TRANSMITTER FOR MP3 Player iPod Touch iphone 4 3GS 3G Transmits stereo quality sound from your portable music player to your car FM radio. All frequency tuning allows endless selection of radio frequencies from 88.1 to 107.9 mhz with an increment of 0.1 mhz. Just tune your car radio into any unused FM channel Powered by vehicle cigarette lighter adapter. Blue LCD backlight display For best sound performance, please set your MP3 player's volume level to MEDIUM