Tracks 20 Body Metrics provides a complete overview of your health including weight, BMI, body fat, muscle mass, hydration, metabolism, and more. Body Composition Analysis measures weight, BMI, body fat, fat mass, and fat-free body weight to help you understand your overall body balance. Muscle & Bone Health Monitoring tracks muscle mass, muscle rate, skeletal muscle, and bone mass to support strength and fitness goals. Hydration & Nutrition Insights measures body water, water weight, protein mass, and protein levels for better nutrition awareness. Metabolism & Fat Level Tracking analyzes subcutaneous fat, visceral fat, and BMR to help manage metabolism and fat distribution. Personal Health Indicators provides body age, ideal body weight, obesity level, and body type for personalized health insights. Breathing LED Light Feedback offers a subtle, stylish light indicator during weighing for a modern and calming user experience. High Accuracy Sensors (50 g / 0.1 lbs) deliver precise and consistent measurements to track progress reliably. Free FitDays App Integration allows easy monitoring of trends, progress, and health goals directly on your smartphone. Multi-App Connectivity automatically syncs with Google Fit, Apple Health, Fitbit, and Samsung Health for a fully connected health ecosystem. Needs 4xAAA batteries