LG TONE Free FP8 UVnano True Wireless In-Ear Headphones (Charcoal Black) - Manual (Page 14)

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ENGLISH
Charging
Wired Charging
When the charging cable is connected, the charging status is displayed in the
charging case.
NOTE: The earbuds and the charging case are charged at the same time.
The charging port on the charging case cannot be used to supply power
to mobile phones, etc.