Akribos XXIV Men's 'Monaco' Automatic Stainless Steel and Leather Casual Watch(Model: AK408SS) Quality automatic movement; functions without a battery; powers automatically with the movement of your arm Krysterna crystal Case diameter: 44 mm Stainless-steel case; carbon-fiber dial Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving