Tissot Men's T41138751 Le Locle Automatic Chronograph Watch Quality Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Scratch-resistant-sapphire crystal Case diameter: 42.3 mm Stainless-steel case; Black dial; Day-and-date functions; Chronograph functions Water resistant to 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion