The pedometer keeps track of your steps and displays it to the user. It also calculates the total distance the user has walked and the total calories the user has burned. It is very easy to use! Simply start walking as you would with your phone in the pocket (or anywhere!) as soon as you turn the pedometer on. This must be done because the pedometer will begin calibration immediately upon activation. The calibration will last for approximately 3 seconds after which it will begin counting the users steps.