Best smart watch within the budget . The performance and features are great. Even without the heart beat sensor the functions is great. It uses a unique algorithm or way to calculate each and every step you take and the results are approximately near to right. it is supported nearly to all the devices wether it is android or ios through it’s mi band app. It is not only water proof but dust proof so that to need to wash your band strap or band device every time . It’s charge to full within one and half hours . overall it is great band for mi