When the Bluetooth page of the mobile phone displays 2 F9s and one of the headsets is silent, the Bluetooth headset has not been successfully paired with TWS. You need to delete the successfully connected F9 on the phone, turn off the Bluetooth function of the phone, and turn on the phone again after the Bluetooth headset TWS is successfully paired Bluetooth pairing connection, The method of TWS pairing is as follows:
TWS pairing: When the left and right earphones are in the Bluetooth pairing state, double-click the touch area of one of the earphones to enter the TWS pairing mode. After the TWS pairing is successful, the other earphone light goes out