Invicta Men's 4699 Subaqua NOMA Collection Automatic 7751 Watch Quality Swiss Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Scratch-resistant-sapphire crystal Case diameter: 51 mm Black-ionic-plated-stainless-steel case; Black dial; Day-date-and-month functions Water-resistant to 1640 feet (500 M)