Omega Men's 3211.30.00 Speedmaster Date Automatic 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: 40 mm Stainless-steel case; Silver dial; Date function; Chronograph functions; Tachymeter function Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving