The headset does not turn off.
When the remaining charge of the rechargeable battery (which is in the charging case) is empty, the headset does not turn off automatically.
To turn off the headset, remove it from the charging case and then press and hold the button on the (L) left unit for about 2 seconds until the indicator (blue) flashes.
Both the (L) left unit and (R) right unit turn off together.