As I had'nt use my pedomer for a very long time I don't know how to even open it to see sreen & buttons fand appply the necessary setttings to "operate" it... for the rest of my life. The model is # 6310638. It has two cells : 2 x "LR43" Button Cells. It isn't hard to have this habillity, I know, I know... Once you'll tell me I will make a brain message so I'll never forget this "How to" again. Thank you for helping me !

Exercise & Fitness - NexxTech