Soundfly AUX lets you listen to MP3 sound files stored in portable memory devices like USB flash memory & SD card, etc through your car radio speakers. Music can play through both Fm frequency and direct connection with Aux port in your car. 1.5 inch Black LCD screen shows playing time, artist name, song name, folder name. It also lets you navigate through files and folders in your portable memory device. Soundfly AUX transmits to all FM frequencies (88.1MHz-107.9MHz) and memorizes up to 4 FM frequencies. It has RDS function that also lets you view artist and song name on your compatible radio display. You can also transmit music from other Mp3 players such as iPod, Zune, Sansa etc. Other functions include bookmarking, repeat, shuffle & volume, treble, bass, contrast adjustment. Fully functional remote control enables easy operation. Just plug USB stick or SD card in Sound-Fly Aux & Enjoy music!