Yamaha TW-E5B - Charging the charging case

Charging the charging case
To charge the charging case, connect the included USB power adaptor.
CAUTION
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The charging case is not waterproof. Do not expose this product to liquids such as sweat, rainwater or seawater.
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Be sure to use the USB power cable that was included with this product.
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When using a USB power adaptor, be sure that the commercially-available adaptor is compatible with 5 V DC (at least 0.5 A)
power output.
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When charging this product inside of China, be sure to use a USB power adaptor that is approved by CCC.
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Charge this product within a temperature range of 5 to 40ºC.
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2
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Type C
Type A
Front
Charging indicators
USB power adaptor
(commercially available)
1 Plug the USB power cable (type C side) into the charging case.
2 Plug the USB power cable (type A side) into the USB power adaptor.
3 Plug the USB power adaptor into the power outlet.
Charging will begin. Charging takes about 2.5 hours.
While the case is charging, the indicators light up as shown below.
Remaining battery power Indicator
100%
75–100%
50–75%
25–50%
0–25%
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Charging and Powering > Charging the charging case