Very good, I had a situation where it started to restart on its own until I thought it might be a defect, but after a brief investigation, it was a system bug. After restoring and deleting from the app, it returned to normal functionality. After 5 days from today's date, it no longer presented the situation. Regarding the watch, it's worth a lot for its price and functionality, I recommend it; it's comfortable and the battery lasts approximately 1 week.