Description
Design and Build
The Xiaomi Watch S4 41mm features a minimalist,, and elegant design, with a premium stainless steel middle frame and a slender 9.5mm profile, making it comfortable for all-day wear and sleep tracking. The 1.32-inch AMOLED screen is very bright, reaching 1500 nits, which ensures high visibility even in direct sunlight. It features a rotating crown for navigation and, in some editions, a lab-grown diamond set on the crown.
Health and Fitness
The device includes comprehensive health features, such as 24/7 monitoring of heart rate and oxygen levels. It introduces an upgraded temperature sensor designed for precise skin temperature measurement, which powers an advanced, high-precision menstrual cycle prediction tool. For fitness enthusiasts, it offers over 150 sports modes and includes a “one-tap” health checkup feature that measures heart rate, blood oxygen, stress, and sleep within 60 seconds.
Smart Capabilities
Running on Xiaomi’s HyperOS 3, the watch delivers a fluid user interface. It supports NFC for contactless payments (via supported providers like Curve) and features Bluetooth calling, allowing users to make and receive calls directly on the watch. It also includes safety features, such as a triple-click crown to call emergency contacts, and a “Find My Phone” tool.
Battery and Connectivity
Despite its smaller size, it offers strong battery endurance, with a 320mAh battery providing up to 8 days of light usage. It supports fast charging, with a 30-minute charge restoring 75% battery life. The watch is compatible with both Android and iOS devices, with some features (like NFC) requiring specific setup in the Mi Fitness app.
Specifications
| Build | Stainless steel bezel and frame |
| SIM | No |
| Display Type | AMOLED, 1500 nits (HBM), 2200 nits (peak) |
| Size | 1.32 inches |
| Resolution | 466 x 466 pixels (~320 ppi density) |
| Protection | Scratch/drop-proof glass |
| Operating System | HyperOS 2 |
| Memory Card slot | No |
| Camera | No |
| Loudspeaker | Yes |
| 3.5mm jack | No |
| WLAN | No |
| Bluetooth | 5.4, A2DP, LE |
| Positioning | GPS, GLONASS, GALILEO, BDS, QZSS |
| NFC | Yes (market/region dependent) |
| Radio | No |
| USB | No |
| Features | Accelerometer, gyro, compass, barometer, heart rate, SpO2, thermometer (skin temperature) Waterproof (5ATM) |
| Battery Type | Li-Po 320 mAh |
| Dimensions | 41.2 x 41.2 x 9.5 mm (1.62 x 1.62 x 0.37 in) |
| Weight | 32 g (1.13 oz) |
Package Includes
1 x Xiaomi Watch S4 41mm (Black)
1 x 2-pin magnetic charging cable (USB-A)
1 x User Manual
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