If you own a Fitbit Ionic, Versa, Versa Lite, Versa 2, and Charge 3, your wearable has a sensor it never used. Dubbed an Sp02 sensor, it can track the oxygen levels in your blood. But turning it on requires FDA approval, so you didn’t benefit from it. That is until now—Fitbit is rolling out the feature in waves to users.
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Source : Fitbit Is Slowly Turning on Blood Oxygen Tracking for Its Wearables
