G-SHOCK
Get mission-ready with the GRAVITYMASTER GRB300-1A4, where aviation precision meets fearless design.
Built for flight and made for the streets, this GRAVITYMASTER packs bold cockpit styling into a tough Carbon Core Guard case. Vivid orange accents blaze across the rugged black dial and bezel, evoking the glow of aircraft instrument lighting. With solar-powered strength, Bluetooth connectivity, and dual time display, you're always locked in—whether you're in the air or on the move.
Dial: Black with Orange Accents
Case Diameter (L× W× H) MM: 59.0 × 54.7 × 15.7
Case Material: Carbon-reinforced Resin (Carbon Core Guard)
Bracelet: Bio-based Resin Band
Construction: Shock Resistant, Carbon Core Guard Structure
Power supply and battery life: Tough Solar (solar-powered), approx. 5 months on full charge (normal use), 18 months on power-saving mode
Glass: Mineral Glass
Gender: Men
Water-Resistance: 200-meter water resistance
World Time: Dual time (Home city time swapping with World time), 38 time zones (38 cities + UTC), daylight saving on/off, auto summer time (DST) switching
Watch Features:
Stopwatch:
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1-second stopwatch
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Measuring capacity: 23:59'59"
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Measuring modes: Elapsed time, split time
Timer:
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Countdown timer
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Measuring unit: 1 second
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Countdown range: 24 hours
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Countdown start time setting range: 1 minute to 24 hours (1-minute/1-hour increments)
Alarm/hourly time signal:
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5 daily alarms
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Hourly time signal
Light:
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LED light (Super Illuminator)
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Selectable illumination duration (1.5 seconds or 3 seconds), afterglow
Light color: LED: White
Calendar: Full auto-calendar (to year 2099)
Mute feature: Button operation tone on/off
Accuracy: ±15 seconds per month (without Mobile Link)
Other features:
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Mobile Link via Bluetooth® (CASIO WATCHES app)
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Flight Log Function
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Hand shift feature (hands move out of the way to provide an unobstructed view of digital display contents)
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Power Saving (hands stop to save power when the watch is left in the dark)
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Battery level indicator
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12/24-hour format
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Date/month display swapping
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Day of the week display (selectable in six languages)
Regular timekeeping:
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Digital: Hour, minute, second, am/pm, month, date, day
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Analog: 2 hands (hour, minute – hand moves every 20 seconds)
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Rotary disc at 9 o’clock: Displays modes such as stopwatch, alarm, battery level, etc.
