Versa 3 and Fitbit Sense already in line for new 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 will only be recorded if your device is using the SpO2 watch face. 
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https://www.wareable.com/fitbit/big-fitbit-update-adds-big-new-features-8198