Xiaomi Watch S4

Highlights

• 1.43″ AMOLED Display

  • 326 PPI, 60Hz refresh rate

  • 1500 nits HBM, 2200 nits peak brightness

  • Moisture-resistant touch controls

• Design & Build

  • Aluminium alloy frame with PVD high-gloss finish

  • Interchangeable bezels and straps

  • Rotating crown for intuitive navigation

  • Colors: Silver, Black, Rainbow

• Battery Life

  • Up to 15 days typical usage

  • 5 min fast charge = 2 days of use

• Smart Features

  • Xiaomi Smart Hub (requires Xiaomi HyperOS 2)

  • Remote photo capture, find my phone, smart home control

  • Quick gestures (finger snap to reject calls, take photos, open apps)

  • NFC payments (Mastercard® / Visa® supported)

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Health & Fitness

• One-tap health insights: Heart rate, stress, SpO₂, sleep, micro health report (60s scan)

• Breathing exercises: Relax, focus, nap, sleep

• High-precision heart sensor with 98% accuracy in typical scenarios

• All-day monitoring: Stress, SpO₂, advanced sleep (manual activation required)

• Sports & Training:

  • 150+ sports modes

  • Running form recognition (vertical ratio, contact time, etc.)

  • On-wrist running courses (from beginner to endurance)

  • Skiing mode with fall detection + emergency contact call

  • L1+L5 dual-frequency GNSS (5 satellite systems)

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Interchangeable Bezel & Strap Kits

Each kit unlocks special watch faces & functions:

• Dual-Tone Ceramic (Blue-gray)

  • GMT dual time zone design

  • Tap small dial to switch second time zone

• Pine Green

  • Stainless-steel engraved bezel

  • Green leather strap, professional look

• Midnight Carbon

  • Forged carbon + copper bezel with unique patterns

  • Exclusive compass-enabled watch face

• Festive Orange

  • Stainless-steel wood-grain engraved bezel

  • Stress monitoring watch face (expressive UI)

• Liquid Silver

  • Artsy liquid-flow effect bezel

  • Fluororubber strap with ripple texture

⚠️ Note: Some special watch faces require the matching bezel & strap kit and can’t be downloaded via Mi Fitness app.

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Connectivity & Ecosystem

• Compatible with Mi Fitness app, Health Connect, Strava, Suunto

• Works best with Xiaomi devices running HyperOS 2

• Smart Hub control for Xiaomi Home devices (OTA updates expanding support from Xiaomi 15 Ultra / 15 series onward)

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✅ In summary, the Xiaomi Watch S4 is a premium smartwatch with a bright AMOLED display, 2-week battery, advanced health tracking, 150+ sports modes, and interchangeable bezels/straps that not only change the look but also unlock exclusive functions.