Xiaomi Watch S4 Rainbow 47.3mm Smartwatch, Rainbow

The Xiaomi Watch S4 is constructed with a 47.3 mm round aluminum alloy case and features a 1.43-inch AMOLED display. This screen has a 466 x 466 pixel resolution and a peak brightness of 1500 nits, ensuring legibility in different lighting environments. An always-on display option is available for constant time and notification visibility. The device runs on Xiaomi HyperOS 2, which provides the interface for smart notifications, music control, and other applications. A Rainbow-colored strap made from a combination of fluororubber and nylon completes the design.

For health and fitness monitoring, the watch includes a heart rate sensor that also measures blood oxygen levels, alongside an accelerometer and gyroscope for activity tracking. It supports multiple sport modes, provides sleep quality analysis, and has a fall detection feature. Outdoor navigation is handled by a multi-system receiver supporting GPS, GLONASS, Galileo, and QZSS. The watch facilitates contactless payments via NFC and connects to smartphones using Bluetooth 5.3, supporting both Android and iOS platforms. With a 486 mAh battery, it provides up to 360 hours of typical usage.

• 5 ATM water resistance rating
• Integrated microphone and speaker for Bluetooth calls
• Onboard barometer, altimeter, and electronic compass
• Removable band for 135–210 mm wrist sizes
• Supports fall detection and a double tap gesture
• Connects via a magnetic charging station
• Total weight of 44.5 grams