Xiaomi Watch S4
Quick details
Released
March 2025
Dimensions
47.3 x 47.3 x 12mm
Operating system
HyperOS 2.0
Display 1.43 inch AMOLED
Battery life Typical usage up to 15 days, AOD usage - up to 5 days
Water resistance 5 ATM
GPS Yes
Sensors GPS, Accelerometer, Gyroscope, Barometric altimeter, Geomagnetic sensor, Ambient light sensor, Optical heart rate, SpO2, Microphone
Technical specifications
General
Release date 2025-03
Product type Smartwatch
Physical size 47.3 x 47.3 x 12mm
Weight 44.5 grams (without strap)
Material Aluminium alloy frame; interchangeable bezel
Water resistance 5 ATM
Color options Classic black and white body
Display type AMOLED
Display size 1.43 inch
Display resolution 466x 466 pixels, 326 PPI
Display brightness Up to 1,500 nits HBM; 2,200 nits peak
Battery Rechargeable battery; 486 mAh
Battery life Typical usage up to 15 days, AOD usage - up to 5 days
Charging 2-pin magnetic charging dock
Sensors
GNSS type Built-in GNSS
GPS Yes
GALILEO Yes
GLONASS Yes
QZSS Yes
Beidou Yes
Accelerometer Yes
Gyroscope Yes
Barometric altimeter Yes
Compass Yes
Geomagnetic Yes
Ambient light sensor Yes
Optical heart rate Yes
Electrical heart rate No
SpO2 Yes
Temperature No
Galvanic skin response No
Microphone Yes
Speakers Yes
Vibration motor Yes
Health & activity tracking
Steps Yes
Distance Yes
Calories burned Yes
Floors Yes
Sports tracking Yes (150+ sports modes)
Sleep Yes
Heart rate Yes
HRV No
Stress Yes
Blood oxygen Yes
Respiration rate No
Skin temperature No
ECG No
Blood pressure No
Body composition No
Glucose No
Hydration level No
UV exposure No
Calorie intake No
Vitality Score Yes (7-day rolling activity score)
Hyperglycemia risk assessment No
Arterial stiffness detection No
Pulse wave arrhythmia analysis Yes
Daily smart features
Smartphone compatibility Android 8.0+ and iOS 14.0+
Operating system at launch HyperOS 2.0
Bluetooth Yes (5.3)
Wi-Fi No
NFC / connected pay Yes
UWB No
Cellular Optional (eSIM version, market dependent)
Smartphone notifications Yes
Bluetooth calling Yes
Smartphone music control Yes
On-board music storage Yes
Voice assistant No
Links
These technical specs are correct to the best of our knowledge at the time of publishing.
