Electro-luminescent backlightAuto light switch, selectable illumination duration, afterglow Dual time 1/100-second stopwatchMeasuring capacity: 99:5959.99-InchMeasuring modes: Elapsed time, split time, 1st-2nd place timesMemory capacity: Up to 60 records (used by lap/split time records and log title screens) Countdown timerMeasuring unit: 1 secondCountdown range: 24 hoursCountdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments)Others: Auto-repeat 3 multi-function alarms (with 1 snooze alarm) Hourly time signal Full auto-calendar (to year 2099) 12/24-hour format Button operation tone on/off Regular timekeepingDigital: Hour, minute, second, am/pm, month, date, day, daylight saving on/off Accuracy: ±30 seconds per month Approx. battery life: 7 years on CR2016 Size of case : 49.1 ×45 × 13.5 mm Total weight : 47g