As far as I know, on mi band 2 it was possible to intercept events by pressing a physical button, but this does not work here, although some third-party applications can still, but this will consume a lot of battery power. The heart rate monitor here is as inaccurate / accurate as on 90% of other fitness bracelets / smartwatches - for sports it is better to buy a separate heart rate monitor with a sensor that will be attached to the chest. Sleep, as far as I know, is tracked only at night and, mainly, by the accelerometer, and not by the pulse (although I don’t know how to determine the sleep phase by the pulse).
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