One of the key features of the newly announced Fitbit Sense is its ECG monitor, which can detect abnormal heart rhythm (also known as atrial fibrillation, or AFib) and give you early warning that you’re suffering from a serious health condition, such as heart disease or a stroke.

The ECG sensor won’t be active when the Sense begins shipping later this month, but the the company has now received clearance for the ECG app from both the FDA and European Union, meaning the feature will be enabled in October.
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https://www.techradar.com/news/the-new-fitbit-sense-will-be-able-to-detect-abnormal-heart-rhythms-from-october