How do I charge the A90 Pro earbuds and charging case?

Place the earbuds correctly into the charging slots and close the lid to begin charging — the LED bar on the case will blink while charging and stop automatically when fully charged. To charge the case, use the included Type-C USB cable; the digital display will flash and show the battery level in real time, displaying '100' when fully charged. You can charge the case and earbuds at the same time or separately. (Page 12)