Casio Men's 'G-Shock' Quartz Resin Sport Watch, Color: Grey (Model: GD120CM-8) 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