As an owner and a techie, I can say that performance is not important for this watch. It has a very low power processor. My screen is on all the time and in this mode it keeps 4 days. If you turn off the screen so that it only lights up when you raise your wrist, it will last 2 weeks. It's waterproof and great for tracking swimming activities. I use it for running, tennis, etc. to keep track of my workouts. It notifies me of emails, calls, messages, etc. The only thing I would like is to send me route notifications when I am talking using Google maps, but this does not happen when paired with my Huawei P30 Pro. Otherwise, a great device.