I was astonished to find out that there is NO MANUAL reset on this unit. So you go for a walk in AM, come home , have lunch. Then take another walk after dinner---you CANNOT reset your mileage to zero !!!! This unit does automatically reset itself each day at midnight to zero. I would say in my opinion that this is one of the absolute WORST systems designs on a product that I have ever seen !!! Its great if you want to tally your TOTAL distance for the day, but what if another family member wants to borrow it for a walk ??? HOW STUPID could OMRON be ???------DO NOT BUY THIS UNIT if you take more then ONE walk per day !