Cannot hear sound from one earphone

Cannot hear sound from one earphone.

The left and right earphones are charged independently from the other. Depending on how you use your earphones, battery consumption differs in the left and right earphones.Therefore, the amount of charge remaining in one of earphones may run out before the other. Put the earphones in the charging case and connect the charging case to an AC adapter or computer using the supplied USB cable to charge the battery. link

The pairing between the left and right earphones has been cancelled. Insert the earphones in the charging case and pair the left and right earphones by pressing the multi-function button on the charging case twice while the lid is open.

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