I went to their site and looked up their “scientific evidence” section. The ring could be a heart rate detector and maybe a sleep monitor.
It doesn’t do anything particular to women.
Beware of data-collecting wearable health devices.
But at least they say this: “Oura will oppose any request to provide legal authorities with access to user data for surveillance or prosecution purposes; we will notify users if we receive any such request, whenever legally permissible.”
For example: Older version of this ring alerted wearer when body temperature changed, stating wearer might be sick etc. It didnt understand how menstrual cycle affects people with periods. They have now done a lot to improve this
It's meant to be the best of the activity trackers at period prediction. They absolutely need a rock solid privacy policy over that.
I'm perimenopausal and it would be kinda nice if my Garmin could tell me when they're really due, but I'm glad it's not risking other people's abortion data.