Description: Main Body Net Weight: About 22.5g (weight Without Wrist Strap) Body Size: 46×33.35×9.99mm (excluding Heart Rate Boss) Screen Size And Type: 1.74 Inches, AMOLED Color Square Screen Screen Resolution: 336×480, 336PPl, Support Full-screen Touch Operation Screen Brightness: Up To 600nits, Supports Automatic Brightness Adjustment Cover Material: 2D Straight Screen Tempered Glass Cover Shell Material: Fiber High-strength Polymer NCVM Sensor: Acceleration Sensor Gyro Sensor Optical Heart Rate And Blood Oxygen Sensor Ambient Light Sensor Waterproof Level: 5ATM Data Connection: Support GNSS, Support NFC, Bluetooth 5.3 Vibration Motor: Rotor Motor Battery Capacity: 289mAh Battery Type: Li-ion Polymer Battery Charging Time: About 80min Applicable Wrist Size: 135-205mm Wristband Material: TPU System Language: Simplified Chinese, Traditional Chinese, English Support System: Android 6.0 Or IOS12.0 And Above Support App: Xiaomi Sports Health Specifications: 1. 1.74" AMOLED Large Screen, High-definition High-definition, Colorful Display 2. Exquisite Fashion Quick Release Wrist Strap 3. Integrated Middle Frame, Minimalist Design, Metallic Luster, Bright Silver And Bright Black Two-color Presentation 4. Watch-level Precise Monitoring, Upgraded Dual-channel Monitoring Module 5. Multidimensional Health Management, Heart Rate | Blood Oxygen | Pressure | Breathing Training | Scientific Sleep | Womens Health Management 6. Independent GNSS Five-star Positioning, No Need For A Mobile Phone, Easy To Record The Movement Track 7. Long Battery Life, Two-week Companionship, 14 Days In Typical Mode, 6 Days In AOD Mode 8. Multifunctional NFC 9. Xiaoai Voice Assistant, Voice Operation Is More Convenient