I use on iPhone. I bought it because health requires monitoring your heart rate and steps. All advertised features work well. Unnecessary just turned off for three days it took only 20% of the charge. There is only one problem so far - after the end of the "do not disturb" mode, notifications from the phone disappeared. Resolved by reboot. For this, one point has flown, for a significant jamb. In general - I recommend.
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