1. Take out 2 Buds headphones from the charging box.
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2. Connect the charger, put the two Buds headphones into the charging case, and check the state of the indicator (middle position).
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The red light immediately turns green - repeat 1,2 steps (this problem is caused by overdischarge, it takes about 10 times to repeat 1,2 steps).
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The red indicator is on for more than 1 minute - it will enter normal charging mode. Close the charging case until it is full. (or charge for at least 20 minutes).
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3. Connect Buds and mobile phone.