Xiaomi S400 Pro Body Fat Scale Bluetooth Smart Body Analysis

The Xiaomi S400 Pro Body Fat Scale is designed for users who want a more complete understanding of their physical condition than a conventional bathroom scale can provide. Instead of displaying only body weight, it uses dual-frequency bioelectrical impedance analysis to estimate multiple body-composition indicators, including body fat percentage, muscle mass, body water, protein level, and visceral fat index. With Bluetooth connectivity, a 3.5-inch colour display, Xiaomi Home app support, and profiles for up to 36 users, it provides a convenient platform for long-term fitness and wellness tracking.

Product Specifications

Specification	Value
Brand	Xiaomi
Product Name	Xiaomi Body Fat Scale S400 Pro
Model	MJTZC03YM
Product Type	Smart Body Fat and Body-Composition Scale
Measurement Technology	Dual-Frequency Bioelectrical Impedance Analysis
Body Metrics	Up to 25 Indicators
Display	3.5-Inch TFT Colour Screen
Connectivity	Bluetooth 5.1
App Support	Xiaomi Home App
Compatible Operating Systems	Android 8.0 or Later and iOS 12 or Later
User Profiles	Up to 36 Users
Measurement Range	0.1–150 kg
Surface Type	ITO-Coated Full-Surface Electrodes
Material	Tempered Glass and Engineering Plastic
Operating Temperature	0°C–40°C
Power Supply	4 × AAA Batteries
Dimensions	300 × 300 × 25.5 mm
Net Weight	Approximately 1.65 kg

About the Xiaomi S400 Pro Body Fat Scale

Traditional scales show only total body weight, which does not explain whether changes are related to fat, muscle, water, or other components. The Xiaomi S400 Pro approaches daily measurement as a more complete body-composition analysis.

It is a practical choice for users comparing advanced health gadgets for weight management, fitness tracking, family wellness, and long-term progress monitoring.

The scale combines intelligent sensors, dual-frequency BIA technology, a full-surface ITO electrode system, Bluetooth 5.1, and app-based data tracking in a compact modern design.

Why Body Composition Matters More Than Weight Alone

Body weight by itself does not indicate whether a user is gaining muscle, losing fat, retaining water, or experiencing other physical changes. Body-composition measurements provide additional context that can make long-term progress easier to understand.

The Xiaomi S400 Pro can estimate indicators such as:

• Body fat percentage
• Muscle mass
• Body water content
• Protein levels
• Visceral fat index

The scale supports up to 25 body indicators, helping users observe broader trends instead of relying on a single number.

Dual-Frequency BIA Technology

The Xiaomi S400 Pro uses dual-frequency bioelectrical impedance analysis. During measurement, the scale sends small electrical signals through the body and measures resistance at different frequencies.

This process helps estimate the distribution of fluids inside and outside cells and provides more detailed body-composition information than a basic single-frequency scale.

Advantages of dual-frequency BIA include:

• More detailed estimation of body-fat distribution
• Improved muscle-mass tracking
• More consistent long-term trend analysis
• Greater stability across repeated measurements

The S400 Pro is intended for personal wellness and fitness tracking. It is not a medical diagnostic device and does not replace professional equipment or medical assessment.

Up to 25 Body-Composition Indicators

The scale can provide up to 25 body indicators through the connected Xiaomi Home app. These measurements help users build a more detailed view of physical changes over time.

The available data can support structured fitness routines, diet plans, weight-management goals, muscle-gain tracking, and general wellness monitoring.

3.5-Inch TFT Colour Display

A built-in 3.5-inch TFT colour screen displays measurement information directly on the scale. Users can view their weight and supported body-composition summaries without opening the mobile application for every measurement.

The integrated display provides:

• Immediate weight information
• Selected body-composition summaries
• Clear, high-contrast visuals
• Personalized display information

This makes daily tracking faster and more convenient for users who prefer quick on-device results.

Bluetooth 5.1 and Xiaomi Home App Support

Bluetooth 5.1 allows the scale to connect directly to a compatible smartphone through the Xiaomi Home app. Wi-Fi is not required for synchronization.

Through the application, users can:

• Track long-term body-composition trends
• View changes through visual progress records
• Store historical measurement data
• Manage multiple user profiles
• Customize measurement and display settings
• Review individual progress over time

The connected functions make the S400 Pro suitable for users building a broader ecosystem of smart home gadgets for convenient health and lifestyle monitoring.

Support for Up to 36 Users

The Xiaomi S400 Pro supports up to 36 separate user profiles, making it suitable for families, shared apartments, fitness groups, and other multi-user environments.

Each user can maintain:

• An individual measurement history
• Separate body-composition records
• Independent app synchronization
• Personalized progress information

Multiple profiles help prevent measurement records from becoming mixed when several people use the same scale.

Full-Surface ITO Electrode Design

The weighing platform uses an ITO conductive coating instead of small traditional metal electrode pads. This allows the full surface to function as a measurement area.

The full-surface design provides several benefits:

• A larger standing area
• More flexible foot positioning
• Improved measurement contact
• A cleaner and more modern appearance

Users should stand barefoot on the scale when taking body-composition measurements so the conductive surface can make appropriate contact.

Tempered Glass and Durable Construction

The upper platform is made from tempered glass, while the main structure uses engineering plastic. This combination provides a smooth standing surface, practical durability, and a modern minimalist appearance.

The scale measures 300 × 300 × 25.5 mm and weighs approximately 1.65 kg. Its slim profile makes it suitable for bathrooms, bedrooms, home gyms, and other personal wellness areas.

Measurement Range up to 150 kg

The Xiaomi S400 Pro supports a measurement range from 0.1 kg to 150 kg. This range makes it suitable for general household weighing and body-composition monitoring.

For more consistent trend tracking, measurements should be taken under similar conditions, such as at the same time of day and on a stable, level surface.

Who Is the Xiaomi S400 Pro Designed For?

The scale is intended for users who want more information than basic body weight alone can provide.

• Fitness enthusiasts tracking muscle gain and fat loss
• People following structured diet plans
• Athletes monitoring physical changes
• Families managing wellness goals together
• Users tracking weight-management progress
• Individuals interested in smart health technology
• Home-gym users monitoring long-term trends

Main Benefits of the Xiaomi S400 Pro

• Provides more information than a basic weight scale.
• Supports up to 25 body-composition indicators.
• Uses dual-frequency BIA for more detailed estimates.
• Displays results on a 3.5-inch TFT colour screen.
• Synchronizes data through Bluetooth 5.1.
• Stores historical measurements in the Xiaomi Home app.
• Supports up to 36 independent user profiles.
• Uses a full-surface ITO conductive platform.
• Supports weight measurement up to 150 kg.
• Helps users observe long-term health and fitness trends.
• Features a slim and modern tempered-glass design.
• Operates using four replaceable AAA batteries.

Design and Material Details

Design Detail	Description
Design Style	Modern square smart scale with a slim and minimalist profile.
Standing Surface	Tempered-glass platform with full-surface ITO conductive coating.
Display	Integrated 3.5-inch TFT colour display provides immediate measurement information.
Stability	Large 300 × 300 mm platform provides space for comfortable foot positioning.
Durability	Tempered glass and engineering plastic provide practical everyday construction.
Placement	Suitable for bedrooms, bathrooms, home gyms, and personal wellness spaces.
Daily Use	Designed for regular weight and body-composition trend monitoring.

FAQ

1. How accurate is the Xiaomi S400 Pro body-fat measurement?

The scale provides consistent body-composition estimates suitable for monitoring long-term trends. It is not a medical device and should not be used as a replacement for clinical testing or professional medical assessment.

2. Does the Xiaomi S400 Pro work without the Xiaomi Home app?

Yes. Basic weight and supported information can be displayed on the TFT screen. The Xiaomi Home app is required to access the complete body-composition analysis, historical records, and long-term progress data.

3. Can multiple people use the same scale?

Yes. The S400 Pro supports up to 36 user profiles, making it suitable for families, shared households, and other multi-user environments.

4. Does the scale measure body fat immediately?

Yes. Body-composition data is calculated after the user steps barefoot onto the conductive surface. Full results can then be synchronized with the Xiaomi Home app.

5. Is the Xiaomi S400 Pro compatible with iPhone and Android?

Yes. It supports devices running Android 8.0 or later and iOS 12 or later through Bluetooth 5.1 connectivity and the Xiaomi Home app.

6. Does the Xiaomi S400 Pro require Wi-Fi?

No. The scale connects directly to a compatible smartphone through Bluetooth 5.1, so Wi-Fi is not required for normal app synchronization.