Yamaha TW-E3C User Manual page 15

Charging and Powering > Charging the charging case
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NOTE
You can also charge the earbuds while the charging case is charging.
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You can charge from the USB port on your computer instead of using a USB power adaptor.
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Once you place the earbuds in the charging case, the indicators on the charging case will show the remaining battery power for five
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seconds (except when the charging case itself is still charging).
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