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 strap

Adjustable strap length: 140-210mm approx.

Silver: fluororubber strap

Adjustable strap length: 140-210mm approx.

Rainbow: fluororubber strap+nylon strap

Adjustable 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 days

Capacity: 486mAh

Display:

Resolution: 466 x 466 pixels，PPI 326

1.43-inch AMOLED display

60Hz 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: Supported

Water 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: Supported

Microphone: 2 mics

NFC: 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® 5.3

Operating system: Xiaomi HyperOS 2

Compatibility: 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)