LED BacklightAuto light switch, selectable illumination duration, afterglow. Flash alertFlashes with buzzer that sounds for alarms, hourly time signal, countdown timer time up alarm 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: 23:5959.99Measuring modes: Elapsed time, split time, 1st-2nd place times Countdown timerMeasuring unit: 1/10 secondInput range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments) 5 alarms (daily or one-time) Hourly time signal 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 life: 7 years on CR2025 Size of case : 55 ×51.2 × 17.4 mm Total weight : 72 g