Accutron Men's Automatic Stainless Steel Casual Watch, Color:Silver-Toned (Model: 26B43) Quality Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Sapphire crystal Case diameter: 40 mm Stainless-steel case; White dial; Date function Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving