Battery life: 3 years on CR1616 Mineral Glass Compatible band size 125 to 180 mm Watch Features World time 29 time zones (30 cities), daylight saving on/off Stopwatch 1/100 second stopwatch Measuring capacity: 23:59'59.99'' Measuring modes: Elapsed time, split time, 1st 2nd place times Timer Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 Minute bis 24 Stunden (1 Minuten Inkremente und 1 Stunden Inkremente) Alarm/hourly time signal 5 daily alarms Hourly time signal Light LED backlight (Super Illuminator) Illumination duration (2 seconds), afterglow Light color LED:White Full auto calendar (to year 2099) Mute feature Button operation tone on/off Accuracy: ±30 seconds per month Other features 12/24 hour format Regular timekeeping: Hour, minute, second, am/pm, month, date, day