The earbuds/charging case cannot be charged
The earbuds cannot be charged.
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 earbuds and charging case.
The charging case cannot be charged.
Make sure the included 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.