LED lightAfterglow AltimeterMeasuring range: -700 to 10,000 m (-2,300 to 32,800 ft.) without reference altitudeMeasuring unit: 5 m (20 ft.)Others: Reference altitude setting*Changeover between meters (m) and feet (ft) BarometerDisplay range: 260 to 1,100 hPa (7.65 to 32.45 inHg)Display unit: 1 hPa (0.05 inHg)Atmospheric pressure differential pointer*Changeover between hPa and inHg ThermometerDisplay range: -10 to 60C (14 to 140F)Display unit: 0.1C (0.2F)*Changeover between Celsius (C) and Fahrenheit (F) World time31 time zones (48 cities), city code display, daylight saving on/off 1/100-second stopwatchMeasuring capacity: 23:5959.99-InchMeasuring modes: Elapsed time, split time, 1st-2nd place times Countdown timerMeasuring unit: 1 secondCountdown range: 24 hoursCountdown start time setting range: 1 minute to 24 hours (1-hour increments and 1-minute increments) Daily alarms5 independent daily alarms 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: ±30 seconds per month Approx. battery life: 3 years on CR2016 Size of case : 49.2 × 50 × 14.1mm Total weight : 101g