Oura has announced that there are now one million users of its ring fitness tracker. The Oura Ring Generation 3 was released late last year with heart rate monitoring and sleep tracking features. In the same statement, the company said it was working on several new features to release this year, such as Workout Heart Rate.
https://www.notebookcheck.net/Oura-Ring-fitness-tracker-hits-one-million-user-milestone-and-announces-upcoming-features.609984.0.html