Soundfly SD lets you listen to sound files such as MP3 & WMA file stored in portable memory devices like USB flash memory & SD card, etc through your car radio speakers. It supports RDS (Radio Data System), so while listening to music, you can see the song and artist's name displayed on your car stereo. Soundfly SD transmits to all FM frequencies (88.1MHz-107.9MHz) and memorizes up to 7 FM frequencies. It comes with fully functional remote control. You can also transmit music from other Mp3 players such as iPod, Zune etc. Just plug USB or SD card in Sound-Fly & Enjoy music!