This AmericanPumpkins body fat scale measures five components of the body: weight, body fat, water, bone mass, and muscle mass. It is equipped with sensors on a tempered glass platform. This scale uses a measurement method called bioelectrical impedance analysis (BIA). This type of technology uses a minute electrical current and passes it through the body to estimate the measurements of each component. It can store information for 8 users. This body fat scale has an auto-on function, LCD backlight, a touch switch, a weight capacity of 330 lbs, And an athlete mode. Athlete mode uses additional software to calculate accurate results for highly active individuals. It is powered by 4x AAA batteries (included).