Omega Men's 3221.30.00 Speedmaster Day-Date Automatic Chronograph Watch Importado Quality Swiss Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Functions without a battery; watch powered automatically with the movement of your arm Domed, anti-reflective scratch-resistant sapphire crystal Stainless-steel case; White dial; Day-date-month functions; Chronograph functions; Tachymeter function Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving