Oris Men&#39;s 674 7542 7154MB Divers Titan Chronograph Automatic Watch Quality Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Scratch-resistant-sapphire crystal Case diameter: 43.9 mm Titanium case; Black dial; Date function; Chronograph functions Water resistant to 990 feet (300 M):suitable for scuba diving to a depth of 30 meters for up to 2 hours