LED backlight (Super Illuminator)Auto light switch, selectable illumination duration, afterglow Flash alertFlashes with buzzer that sounds for alarms, hourly time signal Multi Time (4 different cities) World time31 time zones (48 cities + coordinated universal time), city code display, daylight saving on/off, Home city/World time city swapping 1/100-second stopwatchMeasuring capacity: 23:5959.99Measuring modes: Elapsed time, split time, 1st-2nd place times Countdown timerMeasuring unit: 1/10 secondCountdown range: 24 hoursCountdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments) 5 daily or one-time alarms Hourly time signal Full auto-calendar (to year 2099) 12/24-hour format Button operation tone on/off Regular timekeepingDigital: Hour, minute, second, pm, month, date, day Accuracy:±15 seconds per month Approx. battery life: 7 years on CR2025 Size of case : 55 × 51.2 × 17.4 mm Total weight : 72 g