The UW-100 and UW-101 are equipped with a 3-axis accelerometer, which detects motion in all directions. This technology allows them to accurately track your steps, even if you put them in your pocket or bag! The UW-series encourages you to keep walking, a simple aerobic exercise that you can do everyday to improve your health. UW-101 Features -3-axis accelerometer -Slim & compact body -Displays steps, distance, and calories -14-day memory -Clock -Motion indicator to display walking intensity -User friendly -Energy efficient with a power saving mode and long battery life