A refined balance of style and smart technology has been introduced with the Xiaomi Watch S4 41mm. Designed with a compact 41mm stainless steel case and a slim 9.5mm profile, premium craftsmanship and lightweight comfort are combined for everyday wear. A vivid 1.32-inch AMOLED display with 466 × 466 resolution and up to 1500 nits HBM brightness ensures sharp visibility even under direct sunlight. With over 200 customizable watch faces and multiple strap options including leather, fluororubber, and Milanese styles, personalized elegance is effortlessly achieved.
Advanced health and fitness tracking capabilities have been integrated to support a more informed lifestyle. High-precision heart rate monitoring, blood oxygen tracking, stress monitoring, advanced sleep analysis with improvement plans, and skin temperature measurement are supported. Enhanced female cycle prediction is enabled through intelligent data integration. With dual-frequency L1+L5 GNSS positioning, 150+ sports modes, Bluetooth heart rate broadcasting, and 5ATM water resistance, accurate workout tracking and outdoor performance monitoring are delivered. Smart features such as NFC payments, Bluetooth calling, emergency SOS, and Xiaomi HyperOS 3 compatibility ensure seamless connectivity and enhanced personal safety.
Key Features & Benefits
1. 1.32″ AMOLED High-Brightness Display
A crisp 466 × 466 resolution with 352PPI density delivers detailed visuals. Up to 1500nits HBM brightness ensures excellent outdoor readability, while a smooth 60Hz refresh rate provides fluid animations.
2. Premium 41mm Slim Design
Crafted from stainless steel with anodized detailing, a sophisticated finish is presented. At approximately 32g (without strap), long-term comfort is maintained for daily wear.
3. Advanced Health Monitoring
Continuous heart rate, SpO₂, stress, and sleep tracking are supported through upgraded sensors and proprietary algorithms. A structured sleep improvement plan is provided based on collected sleep data. Skin temperature monitoring detects subtle changes as small as 0.1°C for proactive wellness tracking.
4. Enhanced Female Health Tracking
Menstrual cycle predictions, ovulation windows, and fertile period insights are calculated by combining historical and real-time physiological data.
5. 150+ Sports Modes with GNSS Precision
Dual-frequency L1+L5 GNSS supports GPS, Galileo, GLONASS, BeiDou, and QZSS systems for accurate outdoor positioning. Professional skiing mode with fall detection and Bluetooth heart rate broadcasting enhance athletic performance tracking.
6. Personal Safety & Emergency Features
Emergency SOS calling, live location sharing, and an emergency siren function provide added security during outdoor activities or nighttime walks.
7. Smart Connectivity & NFC Payments
Contactless payments via supported Mastercard® and Visa® networks are enabled through NFC functionality (region dependent). Bluetooth calling, smart notifications, and Xiaomi Smart Hub device control enhance daily convenience.
8. Long-Lasting Battery Performance
Up to 8 days of battery life under light usage ensures reliable all-week performance, powered by a 320mAh lithium-ion polymer battery.
Specifications
Dimensions:
41.2mm × 41.2mm × 9.5mm (excluding strap and protrusions)
Weight: Approx. 32g (without strap)
Frame Material:
Stainless steel
Strap Options:
Black – Fluororubber (120–190mm adjustable)
Mint Green – Fluororubber (120–190mm adjustable)
White – Leather (120–190mm adjustable)
Sunset Gold – Milanese (130–190mm adjustable)
Display:
1.32-inch AMOLED
Resolution: 466 × 466 pixels
352 PPI
60Hz refresh rate
Brightness: Up to 1500nits (HBM)
Sensors:
Heart rate sensor (with blood oxygen sensor)
Accelerometer
Gyroscope
Ambient light sensor
Electronic compass
Barometer
Temperature sensor
Satellite Positioning Systems:
GPS | Galileo | GLONASS | BeiDou | QZSS
Battery:
Capacity: 320mAh
Light usage: Up to 8 days
Normal usage: Up to 4 days
Heavy usage: Up to 3 days
Battery Chemistry: Lithium-ion polymer
Water Resistance:
5ATM (up to 50 meters; suitable for swimming, not diving or hot showers)
Connectivity:
Bluetooth® 5.4
Built-in GNSS
NFC (region dependent)
Bluetooth calling supported
Speaker & Microphone:
Built-in speaker
1 microphone
Operating System:
Xiaomi HyperOS 3 (OTA availability from September 2025)
Compatibility:
Android 8.0 and above
iOS 14.0 and above
Charging:
2-Pin magnetic charging dock
Conclusion
Premium craftsmanship, a high-brightness AMOLED display, advanced health tracking technology, dual-frequency GNSS precision, and comprehensive smart safety features are combined in the Xiaomi Watch S4 41mm. With extended battery life, NFC payment support, and seamless smartphone connectivity, a versatile and stylish smartwatch solution is delivered for users seeking performance, personalization, and dependable everyday functionality.
