This sleek Health o meter Carbon Fiber Digital Scale calibrates itself automatically and uses Step-On Technology to instantly deliver weight and BMI results Stores information and tracks last weigh-in for up to 4 users with a 0.2-lb accuracy up to 400 lbs Takes three AAA batteries (included) Has an oversized 1.6-inch blue backlit digital display, and large 12.4" x 12.4" carbon fiber platform