The G-SHOCK GA-100BEG-1A features a striking black and electro green aesthetic, pairing an electro green-accented LCD against a matte black resin bezel, band, and dial.

Equipped with built-in LED illumination, the digital display ensures clear readability in dark conditions, while the rugged build offers shock resistance, magnetic resistance, and 200-meter water resistance.

This analog-digital timepiece includes extensive functionality such as world time across 29 time zones, a 1/1000-second stopwatch, a 24-hour countdown timer, 5 daily alarms, and a full auto-calendar.

Key Features

Case Size (L × W × H)	55 × 51.2 × 16.9 mm
Weight	72 g
Case and Bezel Material	Resin
Band	Resin Band
Construction	Shock Resistant, Magnetic Resistant
Water Resistance	200 m
Power Supply and Battery Life	Approx. battery life: 2 years on CR1220
Glass	Mineral Glass
Compatible Band Size	145 to 215 mm
World Time	World time 29 time zones (48 cities + coordinated universal time), daylight saving on/off, home city/world time city swapping
Stopwatch	1/1000-second stopwatch Measuring capacity: 99:59'59.999'' Measuring modes: Elapsed time, lap time, split time Others: Speed (0 to 1998 units/hour), Distance input (0.0 to 99.9) Mach indicator (speed exceeding 1225 units/hour)
Timer	Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments) Other: Auto-repeat
Alarm/Hourly Time Signal	5 daily alarms (with 1 snooze alarm), Hourly time signal
Light	LED light Auto light switch, selectable illumination duration (1.5 seconds or 3 seconds), afterglow
Light Color	LED: Amber
Calendar	Full auto-calendar (to year 2099)
Accuracy	±15 seconds per month
Other Features	12/24-hour format, Regular timekeeping: Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (speed) Digital: Hour, minute, second, pm, month, date, day

Highlights

Shock resistant
20 bar water resistant
Easy to see in darkness

Frequently asked questions

What is the water resistance rating of the GA-100BEG-1A?

This watch features 200-meter water resistance (20 bar).

What materials are used for the case and band?

The case, bezel, and band are made from durable resin, fitted with mineral glass over the dial.

What is the expected battery life?

The watch offers an approximate battery life of 2 years using a CR1220 battery.

What wrist sizes does the band fit?

The compatible band size ranges from 145 to 215 mm.

Does this watch feature backlighting?

Yes, it includes an amber LED light with an auto light switch, afterglow, and selectable illumination durations of 1.5 or 3 seconds.

What are the dimensions and weight of the watch?

The case measures 55 × 51.2 × 16.9 mm and the total weight is 72 g.

Casio G-Shock Green And Black Dial Digital Watch GA-100BEG-1ADR