Parameters: 1. Talkback echo cancellation and noise suppression (CVC) technology 2. Bluetooth answer, hang up and reject call, Redial, Private answering, etc. 3. Support Bluetooth stereo music player 4. Support broken screen display 5. Support audio output 6. Support car battery voltage detection 7. Support TF card (1G-32G) 8. Support MP3 / WMA format music 9. Support FM full-band transmitter 87.5-108.0MHz 10. Automatic power-off memory function 11. Support 5V / 3.4A cell phone charging 12. USB1 support USB flash disk function, 5V / 1A cell phone charging 13. USB2 support automatic charging recognition, 5V / 2.4A cell phone charging 14. Support automatic Bluetooth binding after it's powered-on. 15. Support caller ID broadcaster function 16. One-button operation function