1.74'' narrow-edge quadrilateral display, High quality metal frame with new straps (Improved Accuracy of Monitoring Your Health and Stress) Improved Accuracy of Your Daily Heart Rate and Blood Oxygen Monitoring Functions are Improved. It can also monitor stress, including sleep while analysis, and we also recommend breathing methods to relieve stress. It is also equipped with over 150 sports modes making it perfect for fitness enthusiasts. Not only can you recognize your swimming posture but it is also compatible with 5 ATM waterproof rating that can withstand 50 meters submersion. In addition, it can also be used to record menstrual cycle and predict which is important for managing women's health Long Battery Life Up to 21 Days and Can Be Full Charged in 75 Minutes: Equipped with a low power consumption sensor and a large capacity battery that manages battery efficiency, allowing you to run time for up to 21 days during standard use. It can also be fully charged in a minimum of 75 minutes Comprehensively enhanced user experience, Up to 21-day ultra-long battery life Multi-dimensional health management, Professional Workout Analysis 150+ sports modes: Multiple training options with precise tracking of your activities