The mystery graph sometimes available in sleep charts seems to suggest that the Versa SPO2 sensor actually works. Because of that, it's time to provide for allowing watch faces (at least when the screen is on) to display the current SPO2 reading (and let you keep the screen on for a while to follow it), and also to allow one via the Android app to calibrate it against a SPO2 finger clip or other known source. And to also show those numbers in that sleep related chart. Also, allow export of raw SPO2 data.
As a side note, it would be nice if the specs for the Charge 4 actually included the SPO2 sensor.
Moderator edit: Subject for clarity
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