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The earphone may not be used for a long time, and the Type-C port is dirty.
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It may also be that the charging cable or charging connector is damaged so that it cannot be charged, and the earphone is not used for a long time, and it needs to be charged for a long time, or it needs to be plugged and unplugged several times. Please clean the USB port and try again, or replace the charging cable or charging port to charge.