Built -in FM transmitter; Read MP3 file from the USB flash disk directly and broadcast through the car FM tuner; LINE-IN function that enables you to enjoy music from the external audio device such as CD, MD Player; Four functional keys: PLAY/PAUSE, PREV/V-, NEXT/V+ and CH; 7 preset channels within 87.7-88.9MHZ; Car cigar socket power wupply (12V DC power); USB 1.1 interface with high transfer speed; 7 green leds that indicate 7 present channels; 1 red LED which indicates work state( play or pause).