Xiaomi Watch S4 Smartwatch, Silver Aluminum alloy frame, refined PVD process Premium texture thanks to PVD technology, multi-level high-gloss details and brushed finish. Serrated design and two-tone dial make the watch look slimmer and narrower. Easy-to-change bezel 2.0 Multiple updates to the structure, material and software functionality. The bezel triggers different watch faces with exclusive functions. Rotary button, quick access "Widgets" The combination of HyperOS 2.0 brings smoother interaction and more efficient operation. Updated screen and call experience 2200 nits maximum brightness, clearer outdoor image Improved dual-microphone noise reduction, Bluetooth calls are clearer Advanced health detection Heart rate accuracy is greatly improved thanks to the latest self-developed algorithm. One-click physical micro-examination function, newly updated. New screening for sleep rhythm disorders and breathing training courses. Advanced professional sports mode. First support for running posture recognition. Detects falls in skiing mode.