airpods case can be charged separately, AirPods headphone case is equivalent to a small charging device, you can charge the headphones, can also be charged separately. If the AirPods are in the charging case and the cover is open, the indicator will show the charging status of the AirPods. When the AirPods are not in the charging case, the indicator will show the status of the charging case. Green means it is fully charged, while amber means there is not enough power left to fully charge the AirPods.