Seiko Men's SNL029 Sportura Kenetic Chronograph Black Stainless Steel Watch Quality Japanese Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Hardlex crystal Case diameter: 15 mm Stainless-steel case; Black dial; Date function; Chronograph functions Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving