Watch FeaturesWorld timeWorld time 31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city/World time city swappingStopwatch1/100-second stopwatch Measuring capacity: 59'59.99'' Measuring modes: Elapsed time, split time, 1st-2nd place timesTimerCountdown timer Measuring unit: 1 second Countdown range: 100 minutes Countdown start time setting range: 1 second to 100 minutes (1-second increments, 1-minute increments)Alarm/hourly time signal5 daily alarmsHourly time signalLightDouble LED light LED light for the face (Full auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow) LED backlight for the digital display (Full auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)Light colorLED:WhiteCalendarFull auto-calendar (to year 2099)Mute featureButton operation tone on/offEnergy saving featurePower Saving (display goes blank to save power when the watch is left in the dark)Battery display/alertBattery level indicatorRun timeApprox. battery operating time: 8 months on rechargeable battery (operation period with normal use without exposure to light after charge) 19 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)AccuracyAccuracy: ±15 seconds per monthOther features12/24-hour formatHand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.)Regular timekeeping: Analog: 2 hands (hour, minute) Digital: Hour, minute, second, pm, month, date, day