How do I activate the Atrial Fibrillation feature?

The Atrial Fibrillation (AFib) can be activated only by the Health page of your LifeWatch. It will take six (6) hours to effectively start with the monitoring, as the watch will monitor and collects the atrial activity to set the more accurate result; the green sensor under the watch will always be on when you activate Atrial Fibrillation (AFib) feature.

Please note: The AFib service is only available if you have an active Helo Wellness+.
Does the Atrial Fibrillation need to be calibrated?