The earphones/charging case cannot be charged
The earphones cannot be charged.
Remove the power supply prevention film from the earphones. (Do this when using for the first time) link
Make sure the charging case is charged in advance.
Wrap a clean cloth soaked with anhydrous ethanol around a toothpick and gently clean the dirt stuck to the ports on the earphones and charging case.
The charging case cannot be charged.
Make sure the supplied USB cable is connected correctly from the charging case to a USB AC adapter or a computer.
If the charging case are connected to the computer via the USB port, check that the computer is powered on.