HiFiMAN TWS 500 Owner's Manual page 6

Charging
Charge the Earbuds
Return the earbuds to the charging case and close it to
charge the earbuds. A white LED light will be illuminated
when charging.
Charge the Charging Case
Plug the charging cable into the charger port to charge the
charging case and earbuds. When charging, the indicator
light will flash, changing to a solid light when the case is
fully charged.
To determine if the case needs to be charged, press the
round button one time. If charging is necessary, the LED
light will flash four times. If the light remains on, the case
is fully charged.
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