Function: Bluetooth headset indicator: A The red and blue flash alternately when the phone is turned on, and the light turns off after the phone is paired successfully. B. The red light is on when charging, and the red light is off when charging. C. The red light flashes 3 times during shutdown. D. Double click the previous song on the left ear, and triple click to decrease the volume. Double click the next song on the right ear, and triple click to increase the volume;