Casio General Ladies Watches Poptone LDF-21-4AVDR - WW Imported 50M Water Resistant, EL Backlight with Afterglow, World Time-29 time zones (48 cities), city code display, daylight saving on/off Countdown Timer, 1/100 second stopwatch, 4 Daily Alarms and 1 Snooze Alarm Hourly Time Signal, Auto Calendar (pre-programmed until the year 2099) 12/24 Hour Formats, Button Tone Operation On/Off, Accuracy: +/-20 seconds per month Battery CR1612, Approx. battery life: 3 years, Module 3037, Size of case / total weight: 44.2 x 32.8 x 9.5mm / 29g