FM TRANSMITTER 1) Body length: 9cm, 5cm remain long after plugging into cigarette lighter. 2) Wire length: 65cm. 3) Adopts 3D sound coding technology, which maintains hi-fi effects of MP3,MD,CD and TV. 4)Developed from frequency phase lock loop ethnology, which ensures stable frequency radiation while functioning at 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. 5) Car audio wireless transmitter with three channel. 6) Operating distance: up to 30 meters. 7) Channel isolation ratio: ?72db. 8) Frequency range: 20 - 1,500Hz. 9) Working current: 25mA±10mA 10) Output current: 200 mA max. 11) Preset frequency station: 106.9, 107.1, 107.5, 106.7 or 87.9, 88.1, 88.5, 88.7