FEATURES: 1)Built-in FM transmitter 2)Read MP3 file from the USB flash disk directly and broadcast through the car FM tuner. 3)LINE-IN function that enables you to enjoy music from the external audio device such as CD, MD player. 4)Four functional keys: PLAY/PAUSE,PREV/V-,NEXT/V+ and CH. 5)7 preset channels within 87.7-88.9 MHz. 6)Car cigar socket power supply (12V DC power) 7)USB1.1 interface with high transfer speed 8)7 green LEDs that indicate 7 preset channels 9)1 red LED which indicates work state (play or pause)