Bluetooth Smart Watch IP67 Waterproof Fitness Tracker, Heart 。?OUTDOOR ADVENTURE WITH YOU - This military outdoor smartwatch is made of special composite material and sturdy aluminum alloy bezel, which has gone through rigorous military-grade testing and supports heat resistance up to 187.96 °F, cold resistance up to -82.78 °F, waterproof, low-pressure resistant, and dust-proof, fearless of harsh environments, making it the perfect companion for outdoor adventures ?GUARD YOUR HEALTH- The watches for men monitors heart rate, blood oxygen and blood pressure in real time with high-precision sensors. This rugged fitness watches for men also monitors sleep, such as deep sleep, light sleep and REM, and provides sleep trends for the last seven days, analyzing your health in real time and helping you adjust to a healthy lifestyle.(Note: The health data can only be used as a reference for exercise and cannot be compared with professional medical equipment data) ?PERSONAL EXERCISE ASSISTANT - The iPhone smart watch has 100+ indoor and outdoor sport modes, customized for those who love to exercise. It records exercise data according to your exercise style, tracks your steps, distance, calories burned, etc., and helps you achieve your fitness goals DS-1278