Akribos XXIV Men&#39;s &#39;Area 52&#39; Automatic Stainless Steel and Rubber Casual Watch(Model Quality automatic movement; functions without a battery; powers automatically with the movement of your arm Scratch-resistant-sapphire crystal Case diameter: 46 mm Stainless-steel case; black-stainless dial Water resistant to 165 feet (50 M): suitable for swimming and showering