While charging the red light is on.
When fully charged the blue light will be lit for 2 minutes and then go out.
Case charging the red light is on. When fully charged the red will go off.
This charging case supports charging and discharging at the same time.
Do not charge your headset for much longer than 2.5 hours at a time, because this can lead to reduction in battery capacity and can void your manufacturer's warranty.