Xiaomi Watch S4 black with 1.43 AMOLED display, advanced specific sports modes, and interchangeable bezel 2.0.AMOLED screen - 1.43´´ circular design - 466x466 resolution (326 ppi) - Bluetooth 5.3 - Mi Fitness app - Xiaomi HyperOS 2.0 - Battery life of up to 15 days (typical use) - Interchangeable silicone strap - 5 ATM water resistance - Black.The Watch S4 is a Xiaomi smartwatch with health tracking through multiple advanced specific sports modes and its optimized algorithm for heart rate monitoring.This is presented framed in a classic and elegant black design with an aluminum body, also sporting a water resistance of 5 ATM.It comes accompanied by an interchangeable bezel and a silicone strap, and is crowned by a 1.43-inch round AMOLED screen.Elegant design with trimmed corners and aluminum frame.The watch dazzles with an elegant and premium design, boasting a frame made of aluminum alloy.Its trimmed corners not only improve its own appearance, but also manage to simulate a thinner and narrower look.Improved interchangeable bezel and exclusive watch faces.The quick-installation interchangeable bezel 2.0 brings with it certain improvements in the structure and materials compared to its predecessor, the Xiaomi Watch S3.In addition, the smartwatch allows you to activate watch faces with specific functions, adapting to your preferences with a touch of personalization.Rotating crown for navigation and quick access to Widgets.Likewise, the Xiaomi S4 smartwatch incorporates a rotating crown, which facilitates both navigation through the screen and quick access to your favorite Widgets.When combined with the advanced HyperOS 2.0 system, the interaction is even smoother and the operations are faster.1.43´´ AMOLED screen with peak brightness of 2200 nits.And if we look at the front of the watch, we can inspect its latest generation 1.43-inch AMOLED screen.This exerts a maximum brightness of 2200 nits, thus guaranteeing a clear vision even outdoors.Dual microphone with noise reduction for Bluetooth calls. To all this we must add two microphones with noise reduction system, which significantly improves the quality of Bluetooth calls compared to the previous model, making them clearer in noisy environments.Improved algorithm for heart rate monitoring.This smartwatch incorporates advanced health care functions, including its own algorithm that improves the accuracy in heart rate monitoring.With just one click, it performs a physical exam of different parameters, and also detects sleep rhythm disorders and offers respiratory training guides.Advanced professional sports mode.To top it off, this Xiaomi S4 watch now has a running posture recognition function, thus supporting a more detailed and effective analysis of your workouts.It also includes fall detection in ski mode, providing additional safety during high-risk activities.Technical specifications Xiaomi Watch S4 Black:.General parameters.Brand: Xiaomi.Product: Smartwatch.Model: Watch S4.Screen.Size: 1.43.Type: AMOLED.Resolution: 466x466, 326 ppi.Maximum brightness: 2200 nits.Connectivity.Connectivity: Bluetooth 5.3.Application: Mi Fitness.Sensors.Health:.Optical heart rate sensor.SpO2 sensor.Movement and environmental:.Accelerometer.Gyroscope.Ambient light sensor.Electronic compass.Barometer.Hall sensor.Battery.Capacity: 486 mAh.Autonomy (typical use): 15 days.Design.Body: Aluminum alloy.Water resistance rating: 5 ATM.Dimensions: 47x47 x 12 mm.Weight: 44.5 g (without strap).Color: Black.Package content.1 x Xiaomi Watch S4 Black.1 x Charging cable.1 x User manual.