Citizen Men's BT0050-09A Eco-Drive Calibre 3150 Watch Light powered Eco-Drive Japanese-quartz movement; Charges in natural sunlight or indoor light Durable, hardened mineral crystal Case diameter: 48 mm Stainless-steel case; White dial; Perpetual-calendar, twin date functions Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving