Roger Dubuis Men's Automatic Stainless Steel and Rubber Sport Watch(Model: SED46 14 C9.N CPG3.13R) 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 dial Water resistant to 660 feet (200 M): suitable for recreational scuba diving