Xiaomi Watch S4 41mm
Quick details
Released
September 2025
Dimensions
41.2 x 41.2 x 9.5 mm
Operating system
Xiaomi HyperOS 3
Display 1.32 inch AMOLED
Battery life Up to 8 days light use; 4 days normal use; 3 days heavy use
Water resistance 5 ATM
GPS Yes
Sensors GPS, Accelerometer, Gyroscope, Barometric altimeter, Compass, Ambient light sensor, Optical heart rate, SpO2, Temperature, Microphone
Technical specifications
General
Release date 2025-09
Product type Smartwatch
Physical size 41.2 x 41.2 x 9.5 mm
Weight 32 g without strap
Material Stainless steel frame
Water resistance 5 ATM
Color options Black, Mint Green, White, Sunset Gold
Display type AMOLED
Display size 1.32 inch
Display resolution 466 x 466 pixels, 352 ppi
Display brightness Up to 1,500 nits
Battery Rechargeable battery; 320 mAh
Battery life Up to 8 days light use; 4 days normal use; 3 days heavy use
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 Yes
Galvanic skin response No
Microphone Yes
Speakers Yes
Vibration motor Yes
Health & activity tracking
Steps Yes
Distance Yes
Calories burned Yes
Floors No
Sports tracking 150+ sports modes
Sleep Yes
Heart rate Yes
HRV Yes
Stress Yes
Blood oxygen Yes
Respiration rate No
Skin temperature Yes
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 Xiaomi HyperOS 3
Bluetooth Yes (5.4)
Wi-Fi No
NFC / connected pay Yes (region dependent)
UWB No
Cellular No
Smartphone notifications Yes
Bluetooth calling Yes
Smartphone music control Yes
On-board music storage No
Voice assistant No
Links
These technical specs are correct to the best of our knowledge at the time of publishing.
