Jaeger-LeCoultre Men's 163842A Master Grande Reveil Alarm Automatic Watch Quality Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Scratch-resistant-sapphire crystal Case diameter: 43 mm Stainless-steel case; Silver dial; Day-date-month-year-and-moon-phase functions Water resistant to 165 feet (50 M): suitable for swimming and showering