The Fitbit Sense and Versa 3 have gained a new feature, albeit only for Fitbit Premium members. Both smartwatches can now track your noise levels as you sleep, and how loudly you are snoring, too.
https://www.notebookcheck.net/The-Fitbit-Sense-and-Versa-3-receive-a-new-feature-with-their-latest-software-updates.562348.0.html
The snore feature works great, kills your batt though.
Snore feature was released months ago on Sense. But in a room where the ambient noise level is 40 dB, it thinks you're snoring at 40db. Nice idea. Someday it might be useful. In the meantime, still no real-time spo2 display.