You have pressed the "Sleep" button on the section of the same name or have made a long press on the touchpad, and want to check that your headband is being recorded. Several indicators:
- A red light inside the front of the headband is visible. It not only indicates that your pulse oximeter is recording but also that your headband is working.
- By pressing the ON / OFF button. The headband will confirm vocally that your night started, as well as the wake up time if it has been set.