They connect to official and unofficial applications without problems. Lots of dials. It is possible to fine-tune each one for yourself. A fully discharged watch absorbed 230 mAh.
Pros
There are no alternatives in their price range. And autonomy and functionality is even better than other more expensive brands. With my settings. About 50 notifications per day + 24/7 heart rate monitoring + and full sleep monitoring + unlocking the phone nearby. The charge is kept for 6 days.