Function: 1. Bluetooth FM transmitter: transfer music to mobile phone, U disk, TF card, MP3 to car audio playback 2: Car charging: You can charge your phone intelligently through USB interface/iPad.3. Car Bluetooth hands-free: The phone makes hands-free calls through Bluetooth with one touch 4. Car USB: Udisk can read the USB interface, or the TF card can be read from card slot 5. High-fidelity stereo, using digital PLL phase-locked loop technology 6. LED display frequency, more convenient to choose; 7. Full-frequency point transmission (up to 200 frequencies can be selected) 8. With power-off memory, the current playback frequency can be remembered 9. Direct key, play/pause, previous/next song, rotate button Features: 1: Small size, suitable for most models 2. Support Bluetooth 4.0/3.0/2.0 device connection. Support operation voice prompt, support caller number 3. Intelligent identification of various Android and Apple mobile phone and other devices, USB charging, maximum output current 3.4A4. Support FM full-frequency point transmission function, a total of 208 frequency points 5. Support digital tube display 6. Support external TF card/U disk, support MP3/WMA music format playback 7. Support answering, hanging, rejecting, callback and other phone functions 8. Support echo cancellation and noise suppression (CVC) technology during calls 9. Support automatic power-off memory function 10. Support Bluetooth stereo A2DP music playback prompt is simple.