Omega Men's 2210.51.00 Seamaster Planet Ocean Automatic Chronometer Chronograph Watch Importado Quality Swiss Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Domed, scratch-resistant sapphire crystal Case diameter: 45.5 mm Stainless-steel case; Black dial; Date function; Chronograph functions Water-resistant to 600 M (2000 feet)