Features: shock resistant electro-luminescent backlight, afterglow 1/100-second stopwatch measuring capacity 2359'59.99" measuring unit 1/100 second (for the first 60 minutes), 1 second (after 60 minutes) measuring modes elapsed time, split time, 1st-2nd place times countdown timer input range 1 second to 24 hours unit 1 second other auto-repeat multi-function alarm hourly time signal auto-calendar (to year 2039) 12/24-hour formats regular timekeeping hour, minutes, seconds, pm, month, date, day accuracy ±15 seconds per month dimensions size 48.5 x 43.0 x 14.7 mm