A digital face displays time in 12- or 24-hour format with date and timer. Features daily alarm, auto repeat, 1/100-second stopwatch, hourly chime, countdown timer and auto calendar (preprogrammed to the year 2039). Stopwatch measures elapsed time, split time and 1st/2nd place times. Auto EL backlight with afterglow lets you see the display in the dark. Included CR2016 battery lasts up to 2 years. Casio G-Shock construction is tough, shock resistant and water resistant to 200m (660 ft.).