Features: The bracelet is made of diamond-shaped lattice texture. The TPU material has a skin-friendly texture and is soft and smooth. The single-breasted design allows you to relax and not fall off. Help you monitor your sleep and generate professional sleep reports, develop healthy sleep habits. Built-in optical heart rate sensor, pay attention to your heart rate changes 24 hours a day, record your heart rate changes in each time on the perfect living APP, outline your heart rate, present your fitness. The APP connection product distinguishes the exercise warm-up, the burning fat, the cardio-pulmonary enhancement and the like by drawing a curve of the data obtained by the monitoring. Let you know the heart rate changes in each time period, reasonably plan the exercise intensity, and release your sports passion more effectively.