Akribos XXIV Men's 'Gladiator' Automatic Stainless Steel and Rubber Casual Watch(Model: AKW9672DBK) Quality automatic movement; functions without a battery; powers automatically with the movement of your arm Scratch-resistant-sapphire crystal Case diameter: 42 mm Stainless-steel case; black-stainless dial Water resistant to 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion