The Omron HJ-203 features a 2D smart sensor technology that will allow you to know precisely when you will be taking a step. It can be more accurate than some other pedometers that use a simple pendulum design. Many older pedometers needed to be worn on the hip on your waistband or belt. The HJ-203 works well when carried in ones pocket, in your purse, or hung around ones neck. It conveniently helps walkers keep track of their day-to-day fitness achievements.