1, 7 LED Preset Indicators for FM Frequencies,7 FM Modulator presets that a local radio station is not broadcasting on (87.7 87.9 88.1 88.3 88.5 88.7 88.9MHz)
2, Channel Button Pressing this button will change the frequency that the FM Transmitter roadcasts on.
3, USB EXT Power 5V Connect to mp3, charge to mp3.
4, 3.5mm Stereo Input Jack Use this jack to connect various audio devices to the FM Transmitter via the headphone jack of any Mp3 player,DVD player,or CD player.
5, 12 Volt DC Adaptor End Insert the 12 Volt DC Adaptor End into the vehicle's 12 Volt power outlet to supply power to the unit.
6, Audio Cable with 3.5mm and 3.5mm Plugs Use this cable to connect various audio devices to the FM Transmitter.

1, Operating Distance: Up to 30 meters.
2, Channel Isolation Ratio: ≥72db
3, Frequency Range: 20-1500Hz
4, Working Current: 45mA±10mA
5, Operating Frequency: Labeled on the unit
6, Output Current: 100 mA max (According to different model)
7, Preset frequency station: 87.7 87.9 88.1 88.3 88.5 88.7 88.9

How to use :
1, Plug the unit into cigarette lighter in your car.
2, Connect input connector in the unit to your portable device output jack and adjust the portable device output to proper level by volume control.
3, Select one of the 7 FM Modulator presets that a local radio station is not broadcasting on.(87.7 87.9 88.1 88.5 88.7 88.9MHz)
4,Tune your car stereo to the same FM frequency as the FM Modulator.
5, Press the play button on the FM Modulator and you can enjoy fantastic music in your portable device now

Note:
The specification may change when we improve this product, then we won`t give other notice.