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, and MD players 4) Four functional keys: play / pause, prev / v-, next / v+, and CH 5) Car cigar socket power supply (12V DC power) 6) USB1.1 interface with high transfer speed 7) 7 green LEDs that indicate 7 preset channels 8) 1 red LED which indicates work state (play or pause)