I have been using this product for 6 months as of today, it functions well and gave a good output.
It can easily be functioned from a mobile apps, which will record your daily statistics. It is water resistant which is very useful because while working out, you sweat alot, so the sweat doesn’t damage the band. Some of its functions are:-
Record the no. of steps you take per day.
Shows how much calories you burned
Shows the heart rate
Monitor your sleeping status
Can set an alarm on it, which vibrates and woke you up without disturbing the others
So, from an experience i’d say this is a very useful and handful product, and the battery last for almost a week.I’d give this product a thumbs up:-)