Does the case charge or do I have to plug in each headset independently? (LENOVO Mirage S3 VR)

Does the case charge or do I have to plug in each headset independently? (LENOVO Mirage S3 VR)

The cases (for 3 or 10 headsets) do not charge the headsets but you can charge individual headsets when they are in the case, just with individual wires hanging out of the case. The cart (for up to 36 headsets) does charge the headsets all at the same time.