Infrared sensor measures pulse at the touch of a finger. Measures distance walked & time elapsed. Measures calories burned. Memory stores 7 days of walking data including steps, distance and calorie data. Target feature measures progress toward and estimates time to reach goal. Step counter measures 0 to 99,999 steps. Digital 12 or 24-hour clock with weekday and alarm HiGloTM electroluminescent backlight for easy viewing. Count up timer up to 99 hours, 59 minutes, 59 seconds Batteries included: 1 CR2032 3v Dimensions: 2.25L x 2.25D x 1.5H (in.) PE82X Series Manual 1.28 Mb Manual for the PE823, PE826, PE828, PE829 Pedometer.