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 when the machine is turned off. Pairing instructions: After starting up, red and blue flash alternately, and the main and auxiliary ears automatically pair. After the pairing is successful, the auxiliary ear lights turn off, and the main ear flashes red and blue alternately. Then use the host to pair with the mobile phone.