LED lightAuto light switch, selectable illumination duration (1.5 seconds or 3 seconds), afterglow World time29 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city / World time city swapping 1/1000-second stopwatchMeasuring capacity: 99:5959.999-InchMeasuring modes: Elapsed time, lap time, split timeOthers: Speed (0 to 1998 units / hour), Distance input (0.0 to 99.9)Mach indicator (speed exceeding 1225 units / hour) Countdown timerMeasuring unit: 1 secondCountdown range: 24 hoursCountdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments)Other: Auto-repeat 5 daily alarms (with 1 snooze alarm) Hourly time signal Full auto-calendar (to year 2099) 12/24-hour format Regular timekeepingAnalog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (speed)Digital: Hour, minute, second, pm, month, date, day Accuracy: ±15 seconds per month Approx. battery life: 2 years on CR1220 Size of case : 55 × 51.2 × 16.9 mm Total weight : 72g