Casio Men's G-Shock GD350 Sport Watch Shock resistant, 200m water resistant, auto led backlight (super illuminator), flash alert, hourly time signal, world time, daylight saving on/off, 5 daily or one-time alarms (1 with snooze) Vibration alert, 1/100 second stopwatch, countdown timer w/direct access, full auto calendar, low battery warning, button operation tone on/off, battery: cr2032, approx. Battery life: 5 years Quartz Movement Case Diameter: 53.4mm Water Resistant 200m (660ft):in General, Suitable for Professional Marine Activity and Serious Surface Water Sports, but not Diving