Based on the successful analogdigital GA100 X-Large G Series, the all-digital version large sizeandwide face not only give a look of power and strength, but make it extremely easy-to-read and use with its oversized buttons. For added visibility in dark conditions, a newly designed high-density LED light has been employed to light up the dial face from behind. The result is a super luminous display thats a true reflection of G-Shocks desire to keep improving timekeeping. Shock Resistant200M Water ResistantAuto LED Backlight (Super Illuminator)Multi-time (4 different cities)World Time5 Independent Alarms (one-time or daily)Hourly Time SignalFlash alertFlasher with buzzer that sounds for alarms, hourly time signal, countdown timer time-up alarm, countdown timer progress beeper1100 second stopwatchCountdown timerFull Auto Calendar (pre-programmed until the year 2099)1224 Hour FormatsButton operation tone onoffAccuracy: -15 seconds per monthBattery: CR2025Approx. battery life: 7 years By G-SHOCK