The improved pedometer algorithm in Mi Band 2 filters out unnecessary movements. This measures steps taken and exercise more accurately. With a built-in motion sensor, Mi Band 2 knows exactly when you begin your workout. You don't have to switch modes or tell it before you start. Measure your heart rate to adjust the length and intensity of workouts. Keep calm and work toward your fitness goals! Idle alerts send a gentle buzz when you have been sitting still for too long. These reminders tell you when it's time for a short walk or water break.