Specification: 1.Built-in FM transmitter. 2. Digital LED display of present frequency, volume,serial number of songs. 3. Frequency range: full frequencies (more than 200 frequencies, 87.5Mhz), 0.1 Mhz gap between channels. 4. With memory of last running status ( frequeccy, song's order). 5. USB2.0 interface with high-speed transmission. 6. Car lighter socket supply power (12V DC Power). 7.Through the Car FM Tuner to read directly the audio frequency file of MP3 format in USB flash disk. 8. Line-in function enables you to enjoy the music from the external audio device such as CD or MD player. 9. Four functional keys: Play/ Pause, Pre V/V-, Next/V+, CH.