Yamaha TW-E3C True Wireless Earbuds (Red) - Manual (Page 12)

Charging and Powering
Charging the earbuds
Charge the earbuds before use by placing them in the charging case.
CAUTION
(
The charging case is not waterproof. Thoroughly wipe off any sweat, rainwater, seawater or other liquids that get on the
earbuds before placing them back in the charging case.
( Charge this product within a recommended temperature range of 5ºC–40ºC.
Indicator
Charging indicators
1
Open the charging case lid.
2
Place the earbuds in the charging case.
The earbud indicators light up while charging, and turn off when charging is completed.
Charging takes about 2 hours.
The earbuds will not charge if they are not touching the charging terminals inside of the
charging case. In this situation, the earbud indicators flash seven times. If this happens, make
sure that the earbuds are correctly seated in their earbud storage compartments within the
charging case, and try charging again.
NOTE
( Remove the earbuds from the charging case the first time you use this product, and peel off the isolation sheets found on each.
(
Once you place the earbuds in the charging case, the indicators on the charging case will show the remaining battery power for five
seconds (except when the charging case itself is still charging).
( When the remaining battery power of the charging case is depleted, the earbuds will not turn on even when they are taken out of
the charging case. If this happens, charge the charging case and then try charging and removing the earbuds again.
(
You cannot connect the earbuds via Bluetooth or use them for playback while they are recharging.
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Charging and Powering > Charging the earbuds