Xiaomi Body Composition Scale S400 PRO Smart Bathroom Scale with 25 Health Metrics, Dual-Frequency BIA, Bluetooth 5.0, Hidden LED Display, Baby & Object Weighing Modes

Dual-frequency bioelectrical impedance analysis delivers lab-grade body composition insight right at home. The Xiaomi Body Composition Scale S400 PRO measures 25 health indicators—from body fat and muscle mass to visceral fat and basal metabolism—with a precision of 50g. Its hidden LED display stays invisible until you step on, and Bluetooth 5.0 syncs every measurement to the Xiaomi Home App automatically.

Overview

This smart scale is built for households: it supports up to 36 user profiles and automatically recognizes each person. The tempered glass platform with ITO coating ensures accurate readings across a range of 0.1–150 kg. Four AAA batteries power the scale for up to 12 months of typical use, so you can place it anywhere without worrying about outlets.

What stands out

• 25 body composition metrics: weight, BMI, body fat rate, muscle mass, water rate, protein rate, bone mineral content, visceral fat grade, basal metabolism, body age, ideal weight, body type, health score, and more.
• Dual-frequency BIA technology for more accurate and stable measurements compared to single-frequency scales.
• Special modes: baby weighing mode (weigh baby in your arms), small object weighing mode, and guest mode for temporary users.
• Hidden LED display: numbers appear only when you step on, keeping the surface sleek and minimalist.
• Automatic cloud sync via Bluetooth 5.0 to the Xiaomi Home App (Mi Home App), where you can track trends and set goals.

Technical details

• Measurement principle: Dual-frequency Bioelectrical Impedance Analysis (BIA)
• Weight range: 0.1 kg – 150 kg
• Weight precision: 50 g
• Connectivity: Bluetooth 5.0
• App: Xiaomi Home App (Mi Home App)
• Display: Hidden LED
• Power: 4 x AAA batteries (included)
• Battery life: ~12 months (typical usage)
• Surface material: Tempered glass with ITO coating
• User profiles: up to 36
• Units: kg, lb, jin
• Operating temperature: 0°C to 40°C

Our verdict

A comprehensive smart scale that goes far beyond weight. With dual-frequency BIA, 25 metrics, and family-friendly features, the Xiaomi S400 PRO is a powerful tool for anyone serious about tracking health at home.