The New M4 Band Comes With A 0.96inch HD Screen and Sleek Light Weight Yet Durable Design Which Makes It Very Comfortable To Wear And Carry Around. Comes With Flexible And Solid Silicon Straps For More Comfort. Waterproof Sweat-proof Design --Waterproof/ Sweat-proof Smart Bracelet - IP67 waterproof allow you washing hands, getting caught in the rain. You can wash hands when you wear it or wear in the rain, but it's better not wear it to swim or bath. It has features such as calling function which enables you receive a call and disconnect it, you can also send and receive messages through it but only supported to android Phones Sports and health: Sports step (3D sensor), calorie consumption, exercise distance, pedometer,Support Dynamic Heart rate, Blood Pressure, Blood Oxygen monitoring, Support call reminder and message reminder Sedentary Reminder--Sometimes you may sit for a long time, which is not good for your health.