1.Transfer audio signal to FM signal and send to car audio-video device wirelessly, without any change of your car, convenient and economical. 2.small and fashionable, easy operation with 2 wave -segment and 8-frequency option, which can effectively avoid interference with local FM station. 3. high quality-price ratio, offer you a private FM music station without any change, only MP3，CD，DVD，MP4 ，MD or computer is enough. 5. with Hi-Fi 3D technology, embody perfect music effection of MP3，CD，DVD，MP4 ，MD or computer, 6. with updated PLL technology of SONY, ensure stable FM signal for enjoying Hi-Fi music within 30 feet. 7. optional colors of products is available.