Features: 1) built-in flash memory 2) FM frequency: 7 FM channels (87.7, 87.9, 88.1, 88.3, 88.5, 88.7, 88.9MHz) 3) Draws power cigarette lighter jack in the car. Voltage: 12V DC 4) Operating current: <100mA 5) Channel switch: press the ''''CH'''' key to switch preset channel 6) Audio source: USB flash disk or MP3 player 7) Transmitting distance: up to 30 meters How to use: 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 one 7 FM channels that do not interfere with local broadcasting stations 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 Color: 1)silver gray 2)pearly white