I use only two functions - a clock and a pedometer. Sometimes I set an alarm. In this form, the battery lasts for 2-3 weeks. I wear it without taking it off. Sleep monitoring is generally useless, but you just have to put up with it. All consumer fitness trackers evaluate sleep "from the ceiling", because an encephalogram is needed to distinguish between sleep phases with confidence. On the other hand, knowing what time you go to bed is also useful.
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