TECHNICAL SPECS Shock Resistant (G-SHOCK) EL backlight with Afterglow Flash Alert Flashes with buzzer that sounds for alarms, hourly time signals 1/100-second stopwatch Countdown timer Multi-function alarm Hourly time signal Full auto calendar (to year 2039) 12/24-hour format Regular timekeeping: Hour, minute, second, pm, month, date, day Accuracy: +/- 15 seconds per month Approx. battery life: 2 years on CR2016 Size of case: 48.9 x 45.4 x 13.4mm