Xiaomi Watch S4 41mm

A Compact Case Built to Wear All Day

The Watch S4 41mm cuts size down to a 41.2mm stainless steel case just 9.5mm thick, so it sits closer to a traditional watch than a typical bulky smartwatch. A 1.32" AMOLED display runs at 466×466 with a 60Hz refresh rate and up to 1500 nits of peak brightness, staying sharp and responsive whether you're checking notifications or reading a workout summary mid-run.

A heart rate sensor with integrated blood oxygen monitoring runs continuously alongside a barometer, compass, and a 0.1°C-precision skin temperature sensor built for cycle tracking and general wellness monitoring. Dual-frequency L1+L5 GNSS pulls from GPS, Galileo, GLONASS, BeiDou, and QZSS for accurate positioning on outdoor runs and rides without needing a phone along.

Bluetooth 5.4 handles calls directly from the wrist through a built-in speaker and microphone, NFC covers contactless payments where supported, and 5ATM water resistance holds up through swimming and daily wear. The 320mAh battery covers up to 8 days of light use, and each color ships with a different strap to match — fluororubber on Black, leather on White, and a stainless steel Milanese band on Sunset Gold.

Key Features

• Compact 41.2mm Case: Slim 9.5mm profile in a lightweight stainless steel body
• 1.32" AMOLED Display: 60Hz refresh rate, up to 1500 nits brightness
• Heart Rate + SpO2 Monitoring: Continuous tracking with skin temperature sensing
• Dual-Frequency GNSS: GPS, Galileo, GLONASS, BeiDou, and QZSS for precise positioning
• Bluetooth Calling: Built-in speaker and microphone for hands-free calls
• Up to 8 Days Battery Life: 320mAh battery for light daily usage

Specifications

• Display: 1.32" AMOLED, 466 x 466 resolution, 352 PPI, 60Hz refresh rate
• Brightness: Up to 1500 nits (HBM)
• Battery: 320mAh — up to 8 days light use, 4 days normal use, 3 days heavy use
• Positioning: Dual-frequency L1+L5 GNSS — GPS, Galileo, GLONASS, BeiDou, QZSS
• Sensors: Heart rate + SpO2, accelerometer, gyroscope, compass, barometer, skin temperature
• Water Resistance: 5ATM
• Connectivity: Bluetooth 5.4, NFC, built-in speaker and microphone
• Case: Stainless steel, 41.2 x 41.2 x 9.5 mm
• Weight: Approx. 32g (without strap)
• Strap: Fluororubber (Black), leather (White), Milanese stainless steel (Sunset Gold)
• Compatibility: Android 8.0+ / iOS 14.0+
• Operating System: Xiaomi HyperOS 3