G-Shock GA-100B LTD Edition White GA-100B-7 Watch Shock Resistant; 200M Water Resistant; Auto LED; World Time; 5 Daily Alarms; 1/100th Sec. Stopwatch Countdown timer, full auto calendar, 12/24 hour format Quartz Movement Case Diameter: 51.2mm Water resistant 200m (660ft):in general, suitable for professional marine activity and serious surface water sports, but not diving