Image: Xiaomi Corporation
Xiaomi Watch S4
Specs verified 2026-10-03 · source
Xiaomi's round smartwatch with a 1.43-inch AMOLED display, 5-system dual-frequency GPS, and up to 15 days of typical battery life.
Official product pageAt a glance
Device overview
Display
1.43-inch AMOLED display with HBM brightness, with up to 1500 nits peak brightness.
Health & sensors
Health and sensor features: Heart rate sensor (with blood oxygen/SpO2 sensor), Accelerometer, Gyroscope, Ambient light sensor, Electronic compass, Barometer sensor, Hall sensor.
Battery
Equipped with a 486 mAh battery rated for Up to 15 days of typical usage.
Connectivity
Supports Bluetooth 5.3 and NFC supported (availability varies by region).
Case & design
Measures 47.3mm x 47.3mm x 12.0mm, with 5ATM water resistance and Aluminum alloy frame.
Specifications
| Design & Build | |
| Water resistance | 5ATM |
|---|---|
| Colors | Silver, Black, Rainbow (bezel and strap kit standard), Dual-Tone Ceramic Blue-gray (special edition) |
| Case dimensions | 47.3mm x 47.3mm x 12.0mm |
| Build materials | Aluminum alloy frame |
| Display | |
| Display | 1.43-inch AMOLED display with HBM brightness |
| Peak brightness | 1500 nits |
| Battery & Charging | |
| Charging time | 2-pin magnetic charging dock; 5 minutes of fast charging delivers 2 days of usage |
| Battery capacity | 486 mAh |
| Battery life | Up to 15 days of typical usage |
| Connectivity | |
| Bluetooth | Bluetooth 5.3 |
| Contactless payments | NFC supported (availability varies by region) |
| Positioning | Dual-frequency GNSS chip: GPS, Galileo, GLONASS, BeiDou, QZSS (5 satellite systems) |
| Software | |
| Operating system at launch | Xiaomi HyperOS 2 |
| Phone compatibility | Requires a Xiaomi smartphone or pad running Xiaomi HyperOS 2 with the Mi Fitness app for full feature support (including Xiaomi Smart Hub) |
| Security & Sensors | |
| Health sensors | Heart rate sensor (with blood oxygen/SpO2 sensor), Accelerometer, Gyroscope, Ambient light sensor, Electronic compass, Barometer sensor, Hall sensor |
Sources & verification
This device is fully verified: every required fact is confirmed from a Tier 1 (manufacturer/official) source.
- Xiaomi CorporationManufacturer specificationsTier 1
Tier 1 sources are the manufacturer's own product pages, technical specification sheets, or support documentation. Tier 2 sources are reputable independent technical references, used only for facts that couldn't be confirmed from official documentation. Last verified 2026-10-03.