This Step n Fit pedometer uses the built-in sensor to count your steps. No GPS tracking, so it can greatly save battery. It also tracks your burned calories, walking distance and time, etc. All this information will be clearly displayed in graphs. Just tap the start button, and it starts counting your steps. Whether your phone is in your hand, bag, pocket, it can auto-record your steps even your screen is locked. Save Power This step counter uses the built-in sensor to count your steps. No GPS tracking, so it barely consumes battery power. No locked Features All features are 100% FREE. You can use all features without having to pay for them.