G-Shock Mens GG-1000-1A5CR Shock resistant, neobrite, mineral glass, mud resistant, 200-meter water resistance, led backlight (super illuminator), digital compass, thermometer, world time, stopwatch Countdown timer, 5 daily alarms, hourly time signal, low battery alert, full auto-calendar, 12/24-hour format, button operation tone on/off, approx. Battery life: 2 years on sr927w x 2 Quartz Movement Case Diameter: 56.2mm Water resistant 200m (660ft):in general, suitable for professional marine activity and serious surface water sports, but not diving