waterproof and sweatproof: With waterproof and sweatproof function, it will not be too hot to make you feel more comfortable when you are exercising. waterproof and dustproof: Waterproof and dustproof, it will not be wet or dry. Luminous waterproof and dustproof design, easy to use. And waterproof and dustproof, easy to clean, durable. waterproof and durable: Waterproof and durable, high quality stainless steel strap. At the same time, waterproof and durable, it will not get hurt even if you're working or running for a long time. IP waterproof rated: Ip waterproof, high quality stainless steel strap. waterproof material: Waterproof, antifog, shock resistant and comfortable. Waterproof material, easy to wear and remove. Waterproof material, durable and easy to clean. It has a waterproof function and can be used when you go out. heart rate monitor: The heart rate monitor is designed to display step counting, calories, mileage and total exercise time. What's more, the heart rate monitor is not restricted by time and temperature.