This pedometer was horrible, and I returned it to Amazon (which was a painless process, by the way). I noticed a problem when I took off the pedometer and put it on my nightstand at night (and then cleared the steps) - and woke up in the morning to have 100+ steps! The pedometer never moved but steps were added. I counted out my steps on the way to work one morning, and it was off by 20%. Very unreliable product, in my experience at least.