The health sensor that stills lie dormant in Fitbit wearables

In 2017, Fitbit made its foray into the smartwatch world with the Ionic. A fitness-focused watch that also brought with it a sensor first for Fitbit.

Fitbit included an SpO2 sensor in a bid to improve the serious health tracking powers of its wearable devices. After the Ionic, it was then placed inside of its Versa smartwatches and its flagship Charge 3 fitness tracker.
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https://www.wareable.com/fitbit/fitbit-spo2-sensor-update-when-will-it-be-turned-on-7730