Hello friends, I run every morning with my Mi Band 2 and it helps me in monitoring my real heart beat. It is completely reliable for every runner and it is usable even harsh conditions like sweats, water resistant, etc. I always connect with my android phone samsung Galaxy S7. It is very simple to use. It can track my walking distance and calories burnt.It is cheap according to its performance and usability. I find it very comfortable to use and especially I love the style and design. The battery last for 15-18 days.