Omron's HBF-400 Fat Loss Monitor with Scale helps users monitor their overall weight while determining body-fat percentage a true indicator of healthy weight loss--the loss of fat not muscle and body mass index (BMI). The HBF-400 is a fast and accurate tool that provides critical health indicators. Measures 3 Fitness Indicators: Body Fat Percentage Body Mass Index(BMI) Body Weight; 4 Person Profile with previous measurement results; Easy on/off switch at the base; Large LCD display; 4 "AA" batteries included.