**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
**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
**Compatibility:**
- System Language: Simplified Chinese, English, Traditional Chinese
- Compatible with Android 8.0 or iOS 12.0 and above
**Features:**
- 150+ sports modes
- Heart rate monitoring
- Sleep tracking
- Stress monitoring
- Breathing exercises
- Blood oxygen monitoring
- Fall detection
- Female health tracking
- High/low heart rate alerts
- Stand reminders
- Low blood oxygen alerts
- High stress alerts
- Menstrual cycle/pregnancy/ovulation reminders
**Other Features:**
- NFC support for various cards
- Network intercom
- Bluetooth intercom
- Customizable watch faces
- App store access
- Music control
- Alarm clock
- Recording
- Countdown timer
- Stopwatch
- Weather
- Find phone
- Flashlight
- Compass
- Barometric altitude
- Common contacts
- Messages
**Water Resistance:** 5ATM
**Compatibility with eSIM:** Yes
**Charging Dock:** Magnetic suction, efficient charging
**Compact and Lightweight Design:** Easy to carry and store
**City Cards Compatibility:** Various cities in China with specific transportation cards
**Usage Instructions:** Detailed instructions for eSIM activation, management, and cancellation
Please note that the specifications may vary based on the model, system, software version, and other conditions. For detailed information, please refer to the product details page and notes.
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