From Casio G-SHOCK G-7900-3 Watch Green, the watch that brought unmatched toughness to personal timekeeping, comes a collection of models that deliver a level of protection. These watches are designed and engineered to become partners of people who like their activities rough and rugged. Major features include four large bezel screws and protruding surfaces that divide the form of the watch into six sections for a fashionable design. Buttons are among some of the largest available in the G-SHOCK lineup for easy operation. Low-temperature resistance allows operation even under very cold conditions, while moon and tide graphs provide essential Other functions include Electro-luminescent backlight, Flash alert, Low temperature resistant (-20C), World time (29 time zones (48 cities), city code display, daylight saving on/off), Tide graph (tide level for specific date and time), 1/100-second stopwatch, Countdown timer, 5 multi-function alarms (with 1 snooze alarm), Hourly time signal, Full auto-calendar (to year 2099), 12/24-hour format, Button operation tone on/off and Regular timekeeping.