Xiaomi Watch S4 47mm Smartwatch, Grey

The Xiaomi Watch S4 operates on the Xiaomi HyperOS 2 system, designed for comprehensive health monitoring and daily use. It is constructed with a 47.3 mm round aluminum case in a silver finish, complemented by a removable grey fluoro rubber strap. The device features a 1.43-inch AMOLED display with a 466 x 466 pixel resolution and a peak brightness of 1500 cd/m², which provides clear visibility in various lighting conditions. It establishes a connection via Bluetooth 5.3 and is compatible with devices running Android 8.0 or newer and iOS 14.0 or newer.

For fitness and health applications, the watch integrates an active heart rate monitor, a blood oxygen sensor, and sleep quality analysis. The internal sensor suite includes an accelerometer, gyroscope, altimeter, and barometer to support its multisport modes and general activity tracking. Its multi-satellite positioning system utilizes GPS, GLONASS, Galileo, and QZSS for accurate location data during outdoor activities. The 486 mAh battery delivers up to 360 hours of operation per charge and replenishes using a magnetic charging connector. The device also includes safety functions such as an SOS alert and fall detection.

• Water resistant to 5 ATM
• Supports NFC for contactless use
• Integrated microphone and speakers
• Receives smart notifications from a connected smartphone
• Provides haptic feedback for alerts and notifications
• Features an always-on display function
• Operated through a responsive touchscreen interface
• Weighs 44.5 grams
• Fits wrist sizes ranging from 140 to 210 mm