Casio Edifice Watch EFA110D-1 10 Year Battery, 30 Page Databank, 8 letters and 6 numerals per page Auto-sort function, 50M Water Resistant, LED Light with Afterglow World Time (29 times zones (30 cities), city code display, daylight saving on/off), 3 Daily Alarms (1 with snooze), Countdown Timer,1/100 second digital stopwatch ,Hourly Time Signal Auto Calendar (pre-programmed until the year 2099),12/24 Hour Formats, Accuracy: +/-30 seconds per month, Battery CR2025