Premium Material: Japan's imported Seiko TIM VK-67 quartz movement has unparalleled precision and timekeeping. The case material is made of 316L Japanese imported stainless steel, which is stronger than ordinary metal, and has been polished through 202 processes. It is often used as a material for aviation parts and scalpels. The surface layer adopts IP plasma electroplating, which is used for aircraft coating, is more resistant to corrosion and sweat produced by daily wear
💧Excellent Waterproof: This watch has standard waterproof performance is 50m(164FT) with three "O"-shaped sealing rings, it provides protection from most of your daily activities in contact with water, but it‘s not recommended to place or wear the watch in places where the temperature is often very different, such as hot baths, saunas, etc. Excessive temperature difference will cause the waterproof rubber ring to expand the gap and cause water to enter the watch when the temperature drops.