This new G-SHOCK is designed and engineered for those special dark, secret missions that demand something extra. The timer function is has a large, specially designed easily identifiable dedicated button for quick and sure operation under the toughest of conditions. When the timer reaches the end of its countdown, you can select to be alerted by either a vibration operation or a tone plus LED flash operation. The special shock absorber design of the back of the watch helps to ensure that vibration is felt by the writs. A high luminance LED can be configured to light for one, three, or five seconds, and an Auto Light feature cause the face to illuminate whenever the watch is tilted towards the face for reading. · Case / bezel material: Resin Resin Band Mineral Glass Shock Resistant 200-meter water resistance LED Backlight (Super Illuminator) Auto light switch, selectable illumination duration, afterglow Flash alert Flashes with buzzer that sounds for alarms, hourly time signal, countdown timer (time up) World time 35 time zones (100 cities), city name display, daylight saving on/off 1/100-second stopwatch Measuring capacity: 999:59'59.99'' Measuring modes: Elapsed time, split time, 1st-2nd place times Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minutes increments and 1-hour increments) Other: Selectable flash alert/vibration alert, direct start from Timekeeping Mode 5 daily or one-time alarms (with 1 snooze alarm), selectable flash alert/vibration alert Hourly time signal Low battery warning Vibrator Full auto-calendar (to year 2099) 12/24-hour format Button operation tone on/off Regular timekeeping: Hour, minute, second, pm, month, date, day Accuracy: 15 seconds per month Approx. battery life: 5 years on CR2032