The Xiaomi Body Composition Scale S400 is a smart health monitoring scale designed to deliver a complete overview of your body condition, not just your weight. Using advanced dual-frequency bioelectrical impedance analysis, it provides up to 25 body composition measurements, helping users understand fat, muscle, and overall body balance more accurately. This scale measures body weight, BMI, body fat percentage, fat mass, muscle mass, muscle percentage, lean body mass, body water percentage, protein mass, protein percentage, bone mineral content, visceral fat level, and basal metabolic rate (BMR). It also calculates body age and generates a comprehensive body score, offering deeper insight into your physical condition and health trends. In addition to body composition data, the S400 supports static heart rate measurement when standing still on the scale. Practical features such as baby and pet weighing mode, small object weighing, and guest mode make it suitable for a wide range of everyday household uses. When paired with the Xiaomi Home app, all measurements are automatically synced and stored, allowing long-term tracking with clear charts and trend analysis. The app supports up to 36 individual user profiles, making it ideal for families while keeping each user’s data private and organized. The Xiaomi Body Composition Scale S400 is powered by replaceable batteries, offering a battery life of up to 6 months under normal usage. By combining detailed body measurements, smart app insights, and long battery performance, it serves as a reliable tool for tracking fitness progress and overall wellness at home.