Product Specification:
1. Plug the unit into cigarette lighter of your car directly.  
2. Plug USB flash dick into car MP3 transmitter through U disk jack ,
3. press the CH button to Select one from 7 FM that not interfere with local broadcasting station .
4. Tune the frequency of your car's stereo to the same as the unit..
5. Press the play button on the FM modulator to enjoy your music.
Voltage: 12V DC Power  
Operating Current : < 100mA  
FM Frequency: 7 FM Channel(87.7, 87.9, 88.1, 88.3, 88.5, 88.7, 88.9MHz)
Channel Switch: Press the 'C' key to switch preset channel  
Audio Source: USB Flash Disk or MP3 Player  
Transmitting Distance:Up to 30 meters