【Large AMOLED Display】Featuring a vibrant 2.07-inch AMOLED color square screen with 432x514 resolution and full-screen touch operation, offering crystal-clear visuals and easy navigation. 【Premium Build Quality】Constructed with an aluminum alloy frame, stainless steel crown, and a 2.5D micro-curved glass cover, ensuring durability and a sleek appearance. 【Comprehensive Health Monitoring】Equipped with optical heart rate and blood oxygen sensors, supporting heart rate, blood oxygen, sleep, stress, and female health monitoring for holistic wellness tracking. 【5ATM Water Resistance】Certified for 5ATM water resistance, suitable for swimming in pools and shallow water activities, enhancing its versatility for various environments. 【Advanced Connectivity】Supports GNSS for accurate positioning, NFC for contactless payments, and Bluetooth-compatible 5.3 for stable connections with smartphones. 【Xiaomi HyperOS Compatible】Runs on Xiaomi HyperOS 2, compatible with Android 8.0 or iOS 12.0 and above, ensuring a smooth user experience across different devices. Specifications: Main body size: 47.5x41.1x11.3mm (excluding heart rate boss) Screen size and type: 2.07 inches, AMOLED color square screen Screen resolution: 432x514, supports full-screen touch operation Screen brightness: 1500nits global brightness Cover material: 2.5D slightly curved glass cover Casing material: aluminum alloy middle frame + stainless steel crown + fiber high-strength polymer Sensors: Acceleration sensor Gyroscope sensor Optical heart rate and blood oxygen sensor Ambient light sensor Geomagnetic sensor Waterproof level: 5ATM Data connection: Support GNSS, support NFC, Bluetooth TM5.3 Vibration motor: linear motor Battery capacity: 550mAh Battery type: lithium-ion polymer battery Applicable wrist size: 135mm-205mm Wristband material: TPU System language: Simplified Chinese, Traditional Chinese, English Supported system: Xiaomi HyperOS 2, Android 8.0 or iOS12.0 and above Supported APP: Mi Health Daily activity record: Supported Heart rate monitoring: Supported Blood oxygen monitoring: Supported Sleep monitoring: Supported Stress monitoring: Supported Female health: Supported Breathing and relaxation: Supported Note: Waterproof level 5ATM (equivalent to 50 meters underwater). Supports wearing in swimming pools, shallow swimming and other shallow water activities, but not suitable for hot showers, saunas and deep diving, and needs to avoid direct impact of high-speed water flow during water sports. The waterproof function is not permanent and may weaken over time.