This depends on the scenario:
1. When the charging case is charging alone, the earbuds can be used;
2. When both the charging case and earbuds are charging simultaneously, the earbuds should be placed in the charging case for charging, so they cannot be removed for use;
3. When the charging case is charging the earbuds, the earbuds should remain in the charging case during charging, so they cannot be removed for use.
Note:
If the charging case is only charging one earbud, the other earbud can be used independently.