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buy voveran The UP24, for example, examines your age, weight, and height, and then uses algorithms to report your daily step counts, how many miles you???ve walked, and how many calories you???ve burned. When you go to sleep, the accelerometer records subtle hand movements to report periods of light sleep, deep sleep, and those annoying periods of complete wakefulness. This type of step and sleep tracking amounts to table stakes in the fit-tech market, and all the trackers in this roundup use accelerometers to one degree or another.