This pedometer uses the built-in sensor to count your steps, which is battery-friendly. 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 or armband, 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, which is battery-friendly.