Smart watch. have long wanted such a type of device as a smart watch. I watched various reviews, read about new releases, features and capabilities. Now almost every large company producing gadgets has its own smart watches. But really successful models, not so much. The main problem of all smart watches, short battery life. On average, they work 2-3 days without recharging. This option does not suit me. Therefore, when choosing a smart watch, one of the main indicators was battery life. Functionality, strength and moisture resistance are also important.