This GoWISE USA Body Fat scale measures four components of the body: body fat, body water, and muscle mass. It has a plastic 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 body fat mass, total body water, and muscle mass. It can store information for 4 users. This Digital Plastic body scale has an Auto-On function, LCD backlight, a touch switch, weight capacity of 400 lbs. and athlete mode. Athlete mode uses additional software to calculate accurate results for highly active individuals. It is powered by (2) CR2032 batteries (included).