G-Shock GA100A-7A Watch - G-Shock GA100A-7A Series watch by Casio. Shock resistant. 200M water resistant. EL backlight with afterglow. World time. 29 time zones (27 cities). City code display. Daylight saving on/off. Four daily alarms. One snooze alarm. Countdown timer. Measuring unit: one second. Auto-repeat function. 1/100 second stopwatch. Measuring capacity: 59’59.99". Measuring modes: elapsed time, split time, 1st-2nd place times. Hourly time signal. Auto calendar (pre-programmed until the year 2039). 12/24 hour formats. Accuracy: +/-15 seconds per month. Battery SR927W x 2. Approx battery life: 3 years. Module 3750. Imported.