Citizen Men's AT0400-57E Eco-Drive Titanium Chronograph Watch Light powered Eco-Drive Japanese-quartz movement; Charges in natural sunlight or indoor light Durable, hardened mineral crystal Case diameter: 40 mm Titanium case; Black dial; Chronograph functions with 24-hour, 60-minute, and 60-second subdials Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving