1) high-quality Music comes the acoustics when connecting with the USB flash disk and MP3 directly. 2) With 3D sound coding technology, which maintains the Hi-Fi effects of MP3,MD, CD and TV 3) It has been developed frequency phase lock loop ethnology, which ensures stable frequency radiation while functioning at a distance of up to 30 meters with no dead areas. It operates through your automobile audio sounding equipment so that you can still enjoy Hi-Fi music Specifications: 1)Built-in flash memory; 2)7 Preset frequency station: 87.7, 87.9, 88.1, 88.3, 88.5, 88.7, 88.9 3)Draws power cigarette lighter jack in the car. Voltage: 12V DC. 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 8)Can supply power for the other MP3 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) 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 Packing: G.W.: 108.5g N.W.: 31.5g