Citizen Men's AT0550-03E Eco-Drive Chronograph Stainless Watch Light powered Eco-Drive Japanese-quartz movement; Charges in natural sunlight or indoor light Durable, hardened mineral crystal Case diameter: 42 mm Stainless-steel case; Black dial; Chronograph, date function; Chronograph functions Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving