>It is able to change the audio signal into frequency; modulation signal and transmit wirelessly to the sound box of the car and play. No need to change any original equipments and is convenient and economic. 2>Fashionable, smart, stereo voice and convenient operation, full frequency is FM87.1 to 107.9 and is changeable. 3>Multi-function make you have your own FM channel; unnecessary to change the MP3,CD of your car. 4>The products adopt the latest 3D technology and make the tone same as laser and CD and television. 5>It has been adopted phaselock loop technology, which ensures stable frequency radiation while functioning at a distance of up to 30M without dead areas so that you can still enjoy HI-FI music at home of in our car. 6>LCD displayer and 30m distance for transmition. 7>Power source:1AAA battery, work for 20 hours.