Heart rate and sleep measurement: You can choose automatic heart rate monitoring, which gives you accurate real-time results and helps you make an optimal fit for your training and lifestyle. The bracelet also records your sleep quality, which helps you analyze your rest and improve your sleep habits. You can get a complete report in the app. Long battery life and water resistant: The sports watch can be fully operational for 5-7 days and on standby for up to 20 days. It is IP67 waterproof and can withstand water splashes from rain and hand washing. Note: Do not use it in the water, such as shower, sauna, swimming, etc. Many functions: The fitness bracelet offers many practical functions such as monitoring body temperature, heart rate, blood pressure, blood oxygen, sleep, calorie consumption, call reminder, call rejection, app notification/push notifications, weather, stopwatch, shake to take pictures, two-way search for mobile, 5 sports modes (running, cycling, rope jumping, badminton, table tennis), 4-level adjustable brightness, 3 different displays, and more. Specifications: Size: 4.4x2.1x1mm Material: TPU strap, ABS Screen size: 0.96" Battery capacity: 90 mAh Screen resolution: 160x80 Standby time: 20 days Working time: 5-7 days Waterproof: IP67 Package includes 1 x activity tracker Operating instructions