Swiss Legend Men's 30012-BLK-BLK Limousine Collection Automatic Watchand Winder Quality Swiss automatic movement; functions without a battery; powers automatically with the movement of your arm Scratch-resistant-sapphire crystal Case diameter: 38 mm Black-ion-plated-Stainless-steel case; black dial; date function Water resistant to 165 feet (50 M): suitable for swimming and showering