Omega Men's 1519.51.00 Constellation Double Eagle Chronometer Chronograph Watch Importado Quality Swiss Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Domed, anti-reflective scratch-resistant sapphire crystal Case diameter: 41 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