If you cant buy expensive watches then you should buy this band in this band there is so many features . its battery life is of 19 days I have used it and I have also try mi band 2 it is also quiet good but I suggest you to buy mi band 3 there is some features changes and its screen big than mi band 2 .
features like : heart bit you can measure your heart bit any time .
: you can also measure how much distance you have walk.
so I suggest you to buy this mi band 3