1. Standard USB 1.1/USB 2.0, With high speed transmission. 2. Connect with USB disk and transmit the music into car stereo, Can transmit more music format such as MP3, WMA. 3. Can transmit external audio sources(CD/MP3 player) through audio signal input jack. 4. Five buttons with more functions. 5. Recollection function about frequency point and songs. 6.14 frequency can be optical at random. 7. Support MMC/SD card. 8. Power from car cigarette lighter directly(DC9-24V) , can be used in any car. 9. The system memoery function.