Ann: New Health Sensor Patent Applications Covering Gaming, Computer Devices, and Other Electronic Hardware, page-212

I suspect these articles will keep coming .... but hey, I'm loving it !

https://www.gizmochina.com/2021/10/02/ticwatch-pro-3-ultra-gps-spec-sheet-reveals-sd-wear-4100-chip-afib-detection-and-more/

This has a picture of the TicWatch Pro 3 Ultra spec sheet.
and these key comments

Alongside the aforementioned features are some new ones. First is the support for irregular heartbeat (IHB)/Atrial Fibrillation detection which the TicWatch 3 Pro GPS doesn’t have. This is confirmation of a report from a few days ago that the TicWatch Pro 3 Ultra GPS along with other upcoming Mobvoi smartwatches will have support for advanced heart rate measurement features.

Mobvoi is yet to announce a launch date for the smartwatch yet but there is a strong chance it will arrive this month.