Specification :

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CASIO G-Shock Shock Resistant AW 591
* 200M Water Resistant
* Auto LED light with Afterglow
* World Time
29 times zones ( 27 cities) , city code display, daylight savings on / off
* 5 Daily Alarms ( 1 with snooze)
* Countdown Timer
Measuring unit: 1 second
Countdown range: 1 minute to 60 minutes
Auto-repeat Function, time up alarm, progress beeper
* 1 / 100 second stopwatch
Measuring capacity: 00' 59 .99 "
Measuring modes: elapsed time, split time, 1st-2nd place times
* Hourly Time Signal
* Auto Calendar ( pre-programmed Until the year 2039)
* 12/ 24 Hour Formats
* Accuracy: + / -15 seconds per month
* Battery: CR1220
* Approx. battery life: 3 years
* Module 4778