Casio G-Shock Digital / Analogue G-Shock Blackout Military GD100-1B Watch. A model equipped with a high-brightness LED backlight from G-SHOCK, which continues to evolve in the pursuit of toughness. Use of a high-brightness LED system and a light guide plate makes the watch easy to read even in the dark. It also has practical functions such as world time, an alarm, and a stopwatch. The color is classic G-SHOCK black, and the brand-color red is used as an accent throughout. Features include: Case size (L× W× H): 55 × 51.2 × 17.4 mm Weight: 72 g Case / bezel material: Resin Resin Band Shock Resistant Water resistance: 200 meter Approx. battery life: 7 years on CR2025 Full auto-calendar (to year 2099) Mute feature: Button operation tone on/off World time Multi Time (4 different cities) World time 31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping Stopwatch 1/100-second stopwatch Measuring capacity: 23:59'59.99'' Measuring modes: Elapsed time, split time, 1st-2nd place times Timer Countdown timer Measuring unit: 1/10 second Input range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments) Alarm/hourly time signal 5 alarms (daily or one-time) Hourly time signal Flash alert feature Flash alert Flashes with buzzer that sounds for alarms, hourly time signal, countdown timer time up alarm Light LED backlight Auto light switch, selectable illumination duration, afterglow. Light color: LED:White Other features 12/24-hour format Regular timekeeping: Hour, minute, second, pm, month, date, day This watch comes with a G-Shock authenticity certificate.