> Charging > Charging the charging case
Charging the charging case
When charging the charging case, be sure to use a USB to AC adapter with DC 5 V power output to avoid malfunction or abnormal heat generation.
Use only the supplied charging cable to charge the System.
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1Open the cover of the charging terminal.
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2Use the supplied USB charging cable to connect the charging case to a PC (power on) or a USB AC adapter (commercially available).
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When it is connected to a PC that is powered on, the blue indicator starts flashing, indicating that charging has started.
The charging time for the charging case is approximately 3 hours.
Indicator on the Charging Case
![case lamp ET90](fig/case lamp ET90_DNTXILbcajdqto.png)
![indicator TWS](fig/indicator_TWS_JEAWILfshrzbjg.gif)
Flashes when charging is in progress. When charging is complete, all the indicators light up once and go off.
After charging is complete, unplug the USB charging cable.