​Big Fitbit update adds Google Assistant and new calling features

Fitbit has released a new update for its wearables OS, and adds some big new health and smart features to its line-up of devices. Fitbit OS 5.1 is the latest update and adds functionality to Fitbit Sense and Fitbit Versa 3. First off, there’s a much-needed tweak to the SpO2 tracking. Currently, blood oxygen levels…
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