Dimensions
47.3mm x 47.3mm x 12.0mm
*Height, width and thickness dimensions exclude the strap and protrusions
44.5g approx. (without inbox strap)
Frame
Aluminum alloy frame
Strap
Black: fluororubber strapAdjustable strap length: 140-210mm approx.
Silver: fluororubber strapAdjustable strap length: 140-210mm approx.
Rainbow: fluororubber strap+nylon strapAdjustable strap length: 135–210mm approx.
Sensors
Heart rate sensor (with blood oxygen sensor) | Accelerometer | Gyroscope | Ambient light sensor | Electronic compass | Barometer sensor | Hall sensor
Satellite positioning systems
GPS | Galileo | Glonass | BeiDou | QZSS
Battery
Typical usage time: 15 daysCapacity: 486mAh
Display
Resolution: 466 x 466 pixels，PPI 3261.43-inch AMOLED display60Hz refresh rate*Display refresh rate may vary across different interfaces. Please refer to the actual usage scenario.Brightness: HBM 1500 nits*The HBM brightness is the maximum brightness when the entire screen lights up.
Specifications
Built-in GNSS: SupportedWater resistance rating: 5ATM*The 5ATM water resistance rating (equivalent to a depth of 50 meters) means it can be worn in swimming pools, while swimming near the shore, and during other shallow water activities. It is not suitable for wearing in hot showers, saunas, or while diving. Make sure to avoid direct impacts from swift currents during water sports. Water resistance is not permanent and may deteriorate over time.Speaker: SupportedMicrophone: 2 micsNFC: Supported*NFC availability may vary by region.Bluetooth calling: Supported*The watch must be kept connected to the smartphone's Bluetooth. Voice calls from third-party apps are not currently supported.Wireless connectivity: Bluetooth® 5.3Operating system: Xiaomi HyperOS 2Compatibility: Supports smartphones with Android 8.0 and above, or iOS 14.0 and above.Charging port: 2-Pin magnetic charging dock
Package contents
Xiaomi Watch S4 (including bezel and strap) / Magnetic charging dock / User manual (including warranty notice)