Go bold with the GA-100-1A4 — where aggressive design meets high-impact performance.
Bold, sporty, and built for durability, the GA-100-1A4 features a striking black body contrasted with vivid red accents for a powerful, energetic look. Its oversized case and multi-layered dial embody the signature toughness of G-SHOCK, while advanced timekeeping features make it perfect for both everyday wear and extreme conditions. Designed for those who want a commanding presence on the wrist, this model delivers rugged reliability with standout style.
Dial: Black dial with bold red accents and multi-layered detailing
Case Diameter (L × W × H) MM: 55 × 51.2 × 16.9
Case Material: Resin
Bracelet: Resin band (Black)
Construction: Shock resistant, magnetic resistant
Power supply and battery life: Approx. 2 years on CR1220
Glass: Mineral glass
Gender: Men / Unisex
Water-Resistance: 200-meter water resistance
World Time
29 time zones (48 cities + coordinated universal time), daylight saving on/off, home city/world time city swapping
Watch Features
Stopwatch:
1/1000-second stopwatch
Measuring capacity: 00'00''000~99'59''999
Measuring modes: Elapsed time, split time
Timer:
Countdown timer
Measuring unit: 1 second
Countdown range: 24 hours
Countdown start time setting range: 1 minute to 24 hours (1-minute increments)
Alarm/hourly time signal:
5 daily alarms (with 1 snooze alarm)
Hourly time signal
Light
Auto LED light
Selectable illumination duration (1.5 seconds or 3 seconds), afterglow
Light color: LED: Amber
Calendar: Full auto-calendar (to year 2099)
Mute feature: Button operation tone on/off
Accuracy: ±15 seconds per month
Other features:
12/24-hour format
Regular timekeeping:
Analog: 2 hands (hour, minute – hand moves every 20 seconds)
Digital: Hour, minute, second, pm, month, date, day
