**Product Specifications:**
**Brand:** MI
**Model:** Xiaomi Watch S4
**Color Options:** Black, Silver, Black Rainbow
**Materials:**
- Aluminum alloy PVD case, stainless steel bezel, glass cover
- Strap Materials:
- Bluetooth Version: Fluororubber / Fluororubber+Nylon
- eSIM Version: Genuine leather
**Dimensions:** 47.3mm x 47.3mm x 12.0mm
**Weight:** Approximately 44.5g (excluding strap)
**Screen:**
- 1.43-inch AMOLED display
- Resolution: 466x466 pixels, 326 PPI
- Brightness: 1500nits (global), 2200nits (peak)
**Battery:**
- Capacity: -
- Type: Lithium-ion polymer
**Compatibility:**
- Android 8.0 or iOS 12.0 and above
**Water Resistance:** 5ATM
**Sensors:**
- Heart rate sensor (including blood oxygen), accelerometer, gyroscope, magnetometer, barometric sensor, ambient light sensor, Hall sensor
**Charging Interface:** Magnetic suction
**Buttons:**
- Top Button: Rotating crown
- Bottom Button: Power
**Other Features:**
- MIUI HyperOS integration
- Bluetooth Mesh Gateway support
- Gesture control for other devices
- Device password protection
**Additional Functions:**
- Sleep breathing risk health study
- Fall detection
- Women's health tracking
- High/low heart rate alerts
- Stand reminder
- Low blood oxygen alerts
- High stress alerts
- Menstrual cycle/pregnancy/ovulation reminders
**Sports Modes:**
- 150+ sports modes
- Automatic sports recognition
- Sports posture recognition
- AI running route planning
- Sports trajectory tracking
- Energy consumption tracking
- Vitality index reminders
**Communication Features:**
- Independent communication (eSIM version)
- Dual-mic noise reduction
- Network intercom
- Bluetooth intercom
**Health Monitoring:**
- High-precision heart rate and blood oxygen monitoring
- Sleep monitoring
- Stress monitoring
- Breathing training
- Sleep breathing risk health study
- Sleep rhythm monitoring
- Sleep schedule recommendations
**Sleep Management:**
- Sleep stage recognition
- Sleep quality scoring
- Sleep behavior analysis
**Other Functions:**
- NFC payment support
- NFC card emulation
- NFC car key support
- Focus notifications
- Third-party app support
- WeChat integration
**Accessories:**
- Xiaomi Watch Charging Dock
**Compatibility with Transportation Cards:**
- Various cities and transportation cards supported
**Note:** Specifications may vary based on model, system, software version, and usage conditions. Please refer to the product details for specific information.
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