Invicta Men's 4348 Pro Diver Collection Automatic Watch Quality Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Sapphire crystal Case diameter: 43 mm Black-ionic-plating-stainless-steel case; White-mother-of-pearl dial; Day-and-date functions Water resistant to 990 feet (300 M):suitable for scuba diving to a depth of 30 meters for up to 2 hours