LED backlight (Super Illuminator)Auto light switch, selectable illumination duration (1.5 seconds or 3 seconds), 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), daylight saving on/off, Home city/World time city swapping 1/100-second stopwatchMeasuring capacity: 23:5959.99-InchMeasuring 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 : 72g