The Omron HJ-203 comes with a 2D smart sensor technology that allows you to know precisely when you are taking a step. It is more accurate than some other pedometers that use a painless pendulum design. Many older pedometers had to be worn on the hip on your waistband or belt. The HJ-203 successful when carried in your pocket, in your designer purse, or hung around ones neck. It conveniently helps walkers keep track of their day-to-day fitness popularity.