Your Fitbit is getting a major new heart health feature

Fitbit is rolling out a major firmware update that’ll allow nine of its most recent fitness trackers to detect signs of atrial fibrillation without you having to open an app.

Atrial fibrillation (also known as A-fib) is an irregular or unusually fast heart rhythm that can be a sign of a potential health condition. Fitness trackers and smartwatches can’t diagnose a condition, but can give you a warning and produce a report that you can share with a health professional.

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