Best answer: I input my age and my bodyweight. I get the impression it tracks heart rate at various levels of activity, and, uses this data to determine calories expended on a real-time basis.
It seems to be accurate to me.
I have been wearing the watch 24/7, except when I remove it to recharge the battery every 10 or 12 days. I bought the watch about 3 weeks ago, more or less.
I hope this helps.
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