?After-sales service?If you have any questions about the band,you are welcome to contact us,we will try our best to solve the problem for you.We support free return service.If you are not satisfied with the strap,please contact us first. ?Personalized design?The band is made of highly elastic nylon material,which is suitable for most people.The band is comfortable and breathable,and it also comes with an adjustment buckle. Users can adjust the size according to their own needs,so as to fit more closely the wrist cooperates with the watch to read body data.It is suitable for people with a wrist size of 4.72"-9.84"(186mm-387mm). Please measure the size of the wrist before purchg. ?Color pattern?There are ten bands in a group, each color and pattern are different, you can choose different straps according to your daily wear, attending any occasion will not be abrupt and still attract attention. ?Installation steps?Without any tools, just insert the band directly into the groove of the watch, which is simple and convenient. The connecting ports at both ends of the band are made of plastic, which is less rusty and damaged than metal, and is lighter and more compact. Although it is made of plastic, the quality is very good, so you can buy it with confidence. ?Compatible models?This elastic band is only compatible with Fitbit sense / versa 3.(NOTE:Not compatible for Fitbit versa / versa 2!!!)(Special attention: There are more than 10 kinds of color mixed packaging, there are 10 pieces of this product, and there will be different colors.).