Xiaomi Watch S4 Smartwatch AMOLED GPS Bluetooth Calling

The Xiaomi Watch S4 combines a traditional round-watch appearance with modern health monitoring, fitness tracking, GPS navigation, and connected smartphone features. Its 1.43-inch AMOLED display provides clear visibility for notifications, workout data, calls, and daily information, while the aluminium-alloy frame and interchangeable bezel design give the watch a more refined appearance than many conventional fitness trackers. With Bluetooth calling, more than 150 sports modes, dual-frequency satellite positioning, 5ATM water resistance, and up to 15 days of typical battery life, the Xiaomi Watch S4 is designed for users who want one wearable for daily routines, exercise, travel, and communication.

What Makes Xiaomi Watch S4 Stand Out?

The Xiaomi Watch S4 combines display quality, fitness features, smartphone connectivity, and customisable design in one wearable device. Unlike basic activity trackers, it includes a speaker, dual microphones, built-in satellite positioning, Bluetooth calling, an interchangeable bezel, and a rotating crown for easier navigation.

Key advantages include:

• 1.43-inch circular AMOLED display
• 466 × 466-pixel resolution
• Up to 2200 nits peak brightness
• 60Hz display refresh rate
• Bluetooth calling with speaker and microphones
• L1 and L5 dual-frequency GNSS positioning
• More than 150 sports modes
• Heart rate, blood oxygen, stress, and sleep monitoring
• Up to 15 days of typical battery life
• 5ATM water-resistance rating
• Interchangeable bezel and strap design
• Mi Fitness app compatibility

Customers comparing smartwatches, fitness trackers, and connected accessories can explore additional options in the AS2 wearable gadgets category.

How Does the AMOLED Display Improve Everyday Use?

The Xiaomi Watch S4 features a 1.43-inch round AMOLED display with a resolution of 466 × 466 pixels, a density of 326 PPI, and a refresh rate of up to 60Hz. Text, watch faces, workout information, call details, and notifications appear clear and smooth, while the circular format maintains the appearance of a traditional wristwatch.

The display offers up to 1500 nits of high-brightness mode and up to 2200 nits of peak brightness in supported conditions. This improves visibility when checking the watch outdoors, exercising in daylight, or viewing navigation and fitness data in bright environments.

Display benefits include:

• Clearer viewing in bright outdoor conditions
• Smooth scrolling through menus and widgets
• Sharp workout statistics and notifications
• Always-on display support
• Automatic and manual brightness adjustment
• Improved touch control when moisture is present

How Does the Interchangeable Bezel Improve Personalisation?

The Xiaomi Watch S4 uses an upgraded interchangeable bezel system that allows users to change the appearance of the watch without replacing the entire device. Compatible bezel and strap kits can create a more formal, sporty, colourful, or casual appearance depending on the occasion.

When a compatible Xiaomi bezel is installed, the watch can recognise the accessory and suggest a matching watch face. Additional bezel and strap kits are sold separately, and regional availability may vary.

Personalisation options include:

• Replaceable decorative bezels
• Quick-release 22mm watch straps
• More than 200 downloadable watch faces
• Custom watch-face backgrounds
• Always-on display designs
• Matching watch faces for selected bezel kits

How Does the Rotating Crown Improve Navigation?

The physical rotating crown provides an alternative to navigating entirely through the touchscreen. Users can rotate the crown to move through widgets, notifications, menus, and application lists, helping reduce repeated swiping on the display.

The watch also includes a second physical button for power controls and quick access to selected functions. This combination is useful while exercising, wearing gloves, or operating the watch when precise touchscreen gestures are less convenient.

What Health Information Can Xiaomi Watch S4 Track?

The Xiaomi Watch S4 includes sensors and software designed to monitor general wellness information throughout the day. It can track heart rate, blood oxygen saturation, stress, sleep patterns, breathing exercises, daily movement, calories, and standing activity. Selected continuous monitoring functions must be enabled manually through the watch or Mi Fitness app.

Available wellness features include:

• All-day heart-rate monitoring
• Blood oxygen saturation tracking
• Sleep duration and sleep-stage monitoring
• Stress monitoring
• Breathing exercises
• Daily steps and calorie estimates
• Standing reminders
• Vitality score
• Approximately 60-second wellness overview

These features are intended for personal wellness and fitness information rather than medical diagnosis. Users looking for other everyday monitoring devices can browse the AS2 health gadgets collection.

How Many Sports Modes Does Xiaomi Watch S4 Support?

The watch supports more than 150 exercise modes, covering common activities as well as specialised indoor and outdoor workouts. It records information such as exercise duration, heart rate, calories, pace, distance, route, speed, and training intensity when the selected activity supports those measurements.

Supported activity categories include:

• Outdoor and indoor running
• Walking and hiking
• Cycling
• Pool and open-water swimming
• Strength training
• Rowing and elliptical training
• Yoga and flexibility exercises
• Winter sports and skiing
• Ball sports
• Outdoor recreation

Running features can also analyse selected form measurements, including vertical ratio, vertical movement, and ground contact time. The Mi Fitness app can store and present completed workout information in greater detail.

How Does Dual-Band GPS Improve Outdoor Tracking?

The Xiaomi Watch S4 includes independent L1 and L5 dual-frequency GNSS positioning. It supports GPS, Galileo, GLONASS, BeiDou, and QZSS satellite systems, allowing the watch to record outdoor routes without relying entirely on the phone’s location signal.

Dual-frequency positioning can improve route stability in environments where satellite signals are affected by tall buildings, trees, or other obstacles. Actual positioning performance still depends on the environment, weather, satellite availability, and how the watch is worn.

Built-in positioning is useful for:

• Outdoor running
• Walking and hiking
• Cycling
• Route recording
• Pace and distance measurement
• Outdoor fitness sessions without carrying a phone

Can Xiaomi Watch S4 Make and Answer Calls?

Yes. The Xiaomi Watch S4 includes a speaker and two microphones for Bluetooth calling. When the watch remains connected to a compatible smartphone, users can answer incoming calls, reject calls, access selected contacts, review recent calls, and continue conversations directly through the watch.

Bluetooth calling depends on an active connection between the smartphone and the watch. It does not operate as a fully independent cellular watch, and voice calls through third-party applications may not be supported.

How Does Xiaomi Watch S4 Improve Daily Convenience?

After pairing with the Mi Fitness app, the watch can display phone notifications, call alerts, weather information, calendar events, alarms, music controls, and other daily information. It can also help locate a connected phone and operate as a remote shutter for compatible smartphone cameras.

Convenience features include:

• Phone notifications
• Incoming call alerts
• Bluetooth calling
• Music playback controls
• Weather information
• Calendar and task reminders
• Alarm, stopwatch, and timer functions
• Find My Phone
• Remote camera control
• Compass and barometer
• Customisable widgets
• Gesture controls on compatible devices

The watch works with the Mi Fitness app on compatible Android and iOS phones. Users can also browse other connected products in the AS2 mobile accessories category.

Can Xiaomi Watch S4 Control Smart Home Devices?

Selected Xiaomi Watch S4 functions can connect with Xiaomi Smart Hub and compatible Xiaomi Home devices when used with supported Xiaomi smartphones, software versions, and regional services. Available controls can vary according to the connected phone, watch firmware, Xiaomi Home app version, and supported smart device.

This can provide convenient wrist access to selected connected products without opening the smartphone app. Other compatible home automation products are available in the AS2 smart home gadgets collection.

How Long Does the Xiaomi Watch S4 Battery Last?

The built-in 486mAh battery provides up to 15 days of operation under Xiaomi’s typical-use testing conditions. Actual battery life depends on display brightness, always-on display use, GPS workouts, Bluetooth calls, notifications, health-monitoring frequency, and other enabled settings.

Battery performance highlights include:

• Up to 15 days in typical usage conditions
• Approximately 60-minute full charging time
• Around two days of use from five minutes of fast charging under test conditions
• Battery-saving options for longer operation
• Magnetic USB charging dock included

Frequent GPS use, continuous health monitoring, Bluetooth calls, maximum screen brightness, and the always-on display can reduce operating time.

Is Xiaomi Watch S4 Water Resistant?

The Xiaomi Watch S4 has a 5ATM water-resistance rating, equivalent to resistance under test conditions at a depth of approximately 50 metres. It can be worn during pool swimming, shallow-water activities, exercise, rain, and normal exposure to splashes.

The watch is not intended for diving, hot showers, saunas, or activities involving high-pressure water. Water resistance can also decrease over time, so the watch and strap should be cleaned and dried after swimming or heavy exercise.

Who Is Xiaomi Watch S4 Designed For?

The Xiaomi Watch S4 is suitable for users who want a smartwatch that balances fitness tracking with a traditional circular design. Its bright display, replaceable bezel, long battery life, Bluetooth calling, and independent positioning make it useful for both everyday wear and structured training.

Recommended users include:

• Android and iPhone users
• Runners and outdoor exercisers
• Gym and fitness users
• Professionals who need wrist notifications
• Users who regularly make Bluetooth calls
• People who prefer a traditional round-watch design
• Travellers who value longer battery life
• Users already using Xiaomi connected devices

Technical Specifications

What Is Included in the Box?

The retail package includes the essential components required for setup, charging, and everyday use. Package contents can vary slightly according to the market and selected colour edition.

• Xiaomi Watch S4
• Watch strap
• Installed bezel
• Magnetic USB charging dock with cable
• User manual
• Warranty documentation

A USB wall adapter may need to be purchased separately if one is not supplied in the regional package.

Is Xiaomi Watch S4 Worth Buying?

The Xiaomi Watch S4 is a strong option for users who want a smartwatch with a bright AMOLED display, long battery life, independent GPS, Bluetooth calling, broad fitness tracking, and a customisable traditional-watch appearance. Its 150+ sports modes and dual-frequency positioning make it suitable for active users, while its notification, calling, calendar, music, and smart-device features provide practical value during everyday use.

Users who require a fully independent cellular watch or access to a large library of third-party smartwatch applications may need a different type of wearable. For buyers who prioritise battery life, fitness tracking, display quality, and Xiaomi ecosystem connectivity, the Xiaomi Watch S4 offers a balanced combination of design and functionality.

FAQ

1. Does Xiaomi Watch S4 support Bluetooth calling?

Yes. The watch includes a speaker and two microphones for making and answering calls while it remains connected to a compatible smartphone through Bluetooth.

2. Is Xiaomi Watch S4 compatible with Android and iPhone?

Yes. The Mi Fitness app is available for compatible Android and iOS devices, although some functions may vary according to the phone model and operating system.

3. How long does the Xiaomi Watch S4 battery last?

The 486mAh battery provides up to 15 days of typical use. Actual battery life depends on GPS tracking, display settings, Bluetooth calls, notifications, and health-monitoring options.

4. Does Xiaomi Watch S4 have built-in GPS?

Yes. It includes independent L1 and L5 dual-frequency GNSS and supports GPS, Galileo, GLONASS, BeiDou, and QZSS satellite systems.

5. How many sports modes does Xiaomi Watch S4 support?

The watch supports more than 150 sports and exercise modes, including running, walking, cycling, swimming, strength training, and winter sports.

6. Is Xiaomi Watch S4 water resistant?

Yes. It has a 5ATM water-resistance rating and can be used for pool swimming and shallow-water activities. It is not suitable for diving, saunas, or hot showers.

7. Does Xiaomi Watch S4 include a charger?

Yes. The standard package includes a magnetic USB charging dock with an attached cable. A separate USB wall adapter may not be included.