Customize your own watch face: The watch includes more than 20 watch faces to choose from. You can also customize the display and set your own photos as the wallpaper. Heart rate and sleep monitoring: You can choose automatic heart rate monitoring, which gives you accurate results, helps you better understand your health, and adapt your lifestyle. The bracelet also records the quality of sleep, which helps you analyze your rest and improve your sleep habits. You can then get a complete report in the app. Long battery life: With one charge, the sports watch can be on standby for up to 15 days. The watch is IP67 waterproof, i.e. it can withstand water splashes, hand washing and rain. Note: Do not use it in and under water, such as showering, bathing, swimming, etc. Many more functions: The fitness bracelet also offers a number of practical functions such as activity tracker (pedometer, calories, distance), PPG/ECG, AI auxiliary diagnostic report, blood oxygen measurement, body temperature, calorie consumption, Lorentz scatter plot, various sports modes, etc. Notifications for calls, texts and app notifications, alarm clock, sedentary reminder, weather report, find the clock function and more. Specifications: Size: 44.5x29.5x12mm Material: Zinc alloy, plastic Battery capacity: 240 mAh Screen size: 1.72 inches Charging time: 2 hours Battery life: 15 days Bluetooth: 5.1 Compatible system: iOS 8.0 and later, Andoid 4.4 and later OBs. The watch's measurement functions are only intended to provide indications of well-being and are not suitable for medical purposes. Package Include: 1 x smartwatch 1 x USB charging cable Operating instructions