Michele Men's Automatic Stainless Steel and Rubber Casual Watch(Model: MWW10B000003) Quality Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Sapphire crystal Case diameter: 47 mm Stainless-steel case; Ivory dial; Date function; Chronograph functions Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving