Invicta Men's 4422 Reserve Sea Vulture Collection Automatic Watch Quality Swiss-automatic movement; functions without a battery; powers automatically with the movement of your arm Scratch-resistant-sapphire crystal Case diameter: 50 mm Black ionic plated titanium case; white-mother-of-pearl dial; date function Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving