Key Features:

Premium 47mm smartwatch with aluminum alloy frame and interchangeable bezels
1.43-inch AMOLED display with up to 2200 nits peak brightness for crystal-clear visibility
24/7 heart rate, SpO2, stress, and sleep tracking for continuous wellness monitoring
Dual-frequency GNSS with GPS, Galileo, GLONASS, BeiDou, and QZSS support
Over 150 sports modes including ski-specific coaching and fall detection
60-second health report and guided breathing exercises for quick check-ins
15-day battery life with 5-minute fast charge for 2-day use
Moisture-resistant touchscreen to prevent water-triggered input errors
Supports NFC payments (Mastercard and Visa, region-dependent)
Bluetooth 5.3 with call functionality via smartphone
Speaker and dual microphones for clear audio performance
Xiaomi HyperOS 2 compatible with Android 8.0+ and iOS 14.0+
Xiaomi Smart Hub integration and third-party app sync with Strava, Suunto, and Health Connect
Remote camera control, gesture commands, and Find My Phone feature
5ATM water resistance suitable for swimming (not for diving or high-pressure environments)
Technical Specifications:

Dimensions: 47.3mm × 47.3mm × 12.0mm (excluding strap)
Weight: Approximately 44.5g (without strap)
Strap Options: Fluororubber or Nylon blends, 135–210mm adjustable
Display: 466 × 466 resolution at 326 PPI, 60Hz refresh rate
Sensors: Heart rate, SpO2, gyroscope, barometer, compass, accelerometer, light sensor, Hall sensor
Battery: 486mAh lithium-ion, magnetic charging dock
In the Box: Xiaomi Watch S4 (with bezel and strap), magnetic charger, user manual, warranty card