Omron Tri-Axis Pedometer (HJ-321) is designed for power walking and aerobic exercise, the HJ-321 counts your aerobic steps separately from normal walking steps, as well as the distance, calories burned, and time you've traveled, giving you more information about your overall activity level. It accurately counts every step, using Omron's 3D smart sensor technology. Just wear it on your hip or place it in your bag or pocket. Omron Tri-Axis Technology: Counts steps accurately and quietly, whether positioned flat, vertically, or horizontally; Two Kinds of Steps: Tracks both regular and aerobic ("brisk") steps separately; Daily Distance and Calories Burned: Calculates and better tracks health; Automatic Reset: Starts with a clean slate each day to track your steps more accurately; Weekly Log: Stores up to seven days of information in memory; resets to zero at midnight, so you're ready to go every morning; Four Tracking Modes: Tracks normal walking steps, aerobic "brisk" steps, calories, and distance.