This new G-SHOCK is designed & 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 & 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 & an Auto Light feature cause the face to illuminate whenever the watch is tilted towards the face for reading Mineral Glass Shock Resistant 200-meter water resistance Case bezel material Resin LED Backlight (Super Illuminator) Auto light switch selectable illumination duration afterglow World time 35 time zones Flash alert 1100-second stopwatch Countdown timer 5 daily or one-time alarms (with 1 snooze alarm) selectable flash alertvibration alert Hourly time signal Low battery warning Vibrator Full auto-calendar (to year 2099) Accuracy ±15 seconds per month Size of case 534 x 508 x 18 mm Total weight 75 g LEDWhite