Xiaomi Watch S4 41mm Black

With a 41mm casing that measures only 9.5mm in thickness, it incorporates a 1.32″ AMOLED display (466 × 466 px) that can hit 2200 nits, alongside next-generation optical sensors and a 320 mAh battery delivering up to eight days of typical usage. HyperOS 2 handles everything, with Bluetooth 5.4 connectivity for calls and multi-constellation GPS, all while keeping a featherlight weight of 32g.

Ultra-compact and customizable design

The aluminium alloy frame comes with an interchangeable bezel and rotating crown; the standard fluorocarbon strap needs no tools and fits any 20mm bracelet. Perfect for smaller wrists without sacrificing presence.

High brightness display

The AMOLED panel reaches 60Hz and stays readable in direct sunlight thanks to its 2200-nit peak. It features a colour Always-On mode and more than 200 watch faces, some animated with mascots that evolve according to activity.

Health and sport 24/7

It tracks heart rate, SpO₂, stress and sleep with a new optical module promising up to 98% accuracy. It provides over 150 sport modes and Bluetooth heart rate transmission for external devices.

Autonomy and fast charging

The 320 mAh battery gives up to 8 days of battery life (or 3 days with AOD on). Five minutes on the magnetic charger adds roughly 48 hours of use, handy for short trips.

Resilience and connectivity

5 ATM certified, it supports pool swimming and cold showers. GPS with Galileo, BeiDou, QZSS and GLONASS support improves accuracy in the city, while optional NFC enables contactless payments in supported regions.

Our expert's opinion

The Xiaomi Watch S4 (41mm) manages to concentrate the experience of the 46mm model in a lighter format, without sacrificing brightness or sensors. Compared to the 41mm Apple Watch Series 9, it offers significantly greater autonomy and a better price-performance ratio, although it lacks ECG and the iOS integration that its rival boasts. Compared to the 40mm Samsung Galaxy Watch 7, it stands out for its interchangeable bezel and express charging, but loses Wi-Fi connectivity and the advanced app store. If you prioritise lightness, battery life and a fluid HyperOS ecosystem, the Watch S4 is one of the most balanced options on the market, maintaining the Chinese firm's renowned price-performance ratio.

Xiaomi Watch S4 41mm Technical Specifications:

• General parameters
  • Brand: Xiaomi
  • Product: Smart watch
  • Modelo: Watch S4 (41 mm)
• Screen
  • Size: 1.32”
  • Type: AMOLED
  • Resolution: 466 x 466, 326 ppi
  • Maximum brightness: 2200 nits
• Connectivity
  • Connectivity: Bluetooth 5.3
  • App: Mi Fitness
• Sensors
  • Health:
    • Optical heart rate sensor
    • Sensor SpO2
  • Movement and environmental:
    • Accelerometer
    • Gyroscope
    • Ambient light sensor
    • Electronic compass
    • Barometer
    • Hall sensor
• Battery
  • Capacity: 320 mAh
  • Battery life (typical use): 8 days
• Design
  • Body: Aluminum alloy
  • Strap: Leather
  • Waterproof rating: 5 ATM
  • Dimensions: 41.2 x 41.2 x 9.5 mm
  • Weight: 32g (without strap)
• Package contents
  • 1 x Xiaomi Watch S4 41 mm
  • 1 x Charging cable
  • 1 x User Manual