The Fitbit Charge 4 gains some high-end features from the Versa and Sense - Android

Fitbit introduced SpO2 tracking with its latest lineup of smartwatches, comprised of the Versa and the Sense, and the feature already made its way into the Ionic. Now blood oxygen saturation tracking is also coming to the much more affordable Fitbit Charge 4, along with a few other neat additions.

SpO2 tracking is part of the latest firmware update that's starting to roll out today. It allows you to use the Charge 4 to track your blood oxygen saturation overnight, and you'll be able to see the average on your wrist every morning.

The Fitbit Charge 4 gains some high-end features from the Versa and Sense was written by the awesome team at Android Police.