Lenovo HW01 smartband its one of the smartest fitness I must say I got it from a local shop for a review it comes with a dynamic heart rate monitor which is the greatest attribute of this band, it fuctions perfectly according to your heart beats which is why I love it so much. it is very light weight band which runs on andriod it runs very smoothly I only charge once a week great great battery life so its great deal with its features and decent look!