12Voltage Wireless Car MP3 FM Modulator Description: The device read mp3 audio file in USB flash disk and transfer the audio signal to the car FM tuner through built-in FM transmitter. You could enjoy the mp3 music through the car FM Tuner. It also has line-in feature which transfers the audio source from external audio devices such as CD,MD player etc. to the car FM tuner. Features: -Built-in FM transmitter -Read MP3 file from the USB falsh disk directly and broadcast the music with car stereo system through the car FM tuner -Line function that enables you to enjoy music from the external audio devices such as CD,MD Player, MP3 player...ect. -Functional Keys: Play/Pause, Prev./V-, Next/V+ and Channel. -7 Preset frequencies ranges from 87.7 to 88.9MHz -Car cigarette socket power supply(12V DC power) -USB1.1 interface -7 green LEDs taht iindicate 7 different FM frequecny -1 red LED indicates working state (Play or Pause) For Flash Memory Disk(USB only) 1-Plug FM modulator into vehicle\'\'s 12Volt cigarette lighter socket 2-Plug your flash Memory disk intor FM modulator\'\'s USB port 3-Select one of the 7 FM modulator presets frequecy which is a local radio station non-broadcasting on. (87.7MHz,87.9MHz,88.1MHz,88.3MHz,88.5MHz,88.7MHz,88.9MHz) 4-Tune your car stereo to be the same FM frequency as the FM modulator 5-Press the play batton on the FM modulator 6-Music/Audio transmits to vehicle\'\'s stereo system For Use with MP3, CD or DVD Player 1-Plug FM modulator into vehicle\'\'s 12Volt cigarette lighter socket 2-Using the audio cable, plug your mp3,CD,DVD player or some other audio device into the FM modulator\'\'s stereo jack 3-Select one of the 7 FM modulator presets frequecy which is a local radio station non-broadcasting on. (87.7MHz,87.9MHz,88.1MHz,88.3MHz,88.5MHz,88.7MHz,88.9MHz) 4-Tune your car stereo to be the same FM frequency as the FM modulator 5-Press the play batton on the FM modulator 6-Music/Audio transmits to vehicle\'\'s stereo system