Lucien Piccard Men's 26928RO Skeletal Case Chronograph Watch Quality Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Scratch-resistant-sapphire crystal Case diameter: 44.2 mm Stainless-steel case; Sunray-silver dial; Day-date-and-month functions; Chronograph functions Water resistant to 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion