Electro-luminescent backlightFull auto EL light, selectable illumination duration, afterglow Solar powered World time31 time zones (48 cities + coordinated universal time), daylight saving on/off 1/100-second stopwatchMeasuring capacity: 23:5959.99-InchMeasuring modes: Elapsed time, split time, 1st-2nd place times Countdown timerMeasuring unit: 1 secondCountdown range: 24 hoursCountdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments) 5 daily alarms (with 1 snooze alarm) Hourly time signal Battery level indicator Power Saving (display goes blank to save power when the watch is left in the dark.) Full auto-calendar (to year 2099) 12/24-hour format Button operation tone on/off Regular timekeeping: Hour, minute, second, pm, month, date, day Accuracy:±15 seconds per month Approx. battery operating time:11 months on rechargeable battery (operation period with normal use without exposure to light after charge)27 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) Size of case : 55.5 × 53.6 × 17.5mm Total weight : 88g