Yamaha TW-E7B Noise-Canceling True Wireless In-Ear Headphones (White) - Manual (Page 10)

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.
When using this product for the first time
(
Remove the earbuds from the charging case the first time you use this product, and peel off the isolation sheets found on each.
Isolation sheet
Indicator
Charging indicators
1
Open the charging case lid.
10
Charging and Powering > Charging the earbuds