Casio G-Shock Master of G-Air Gravitymaster Tough Solar Men's Watch | GR-B300RY-1A9
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01934-764333The sky’s the limit! Introducing the GRAVITYMASTER GR-B300-8A2DR, a piece of aviation-inspired professional gear designed to work even in the harshest environments, from the G-SHOCK MASTER of G line.
Item
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Brand
Casio G-Shock
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Series
Master of G-Air
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Gender
Men's
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Model
GR-B300RY-1A9DR
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Brand Origin
Japan
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UPC
4549526397936
Case
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Case Size
54.7mm
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Case Thickness
15.7mm
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Case Material
Bio-based Carbon / Bio-based resin
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Case Color
Black
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Case Back
Solid
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Case Shape
Round
Dial
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Dial Color
Black
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Dial Type
Analog
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Crystal
Mineral Glass
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Bezel
Fixed
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Bezel Color
Black
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Bezel Material
Bio-based Carbon / Bio-based resin
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Light
Neon Illuminator (Black light LED)
Movement
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Movement
Quartz (Solar)
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Movement Source
Japan
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Power supply
Tough Solar (Solar powered)
Band
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Band Material
Bio-based resin band
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Band Type
Strap
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Band Width
N/A
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Band Color
Yellow
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Clasp
Tang
Additional Information
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Water Resistance
200 Meters / 660 Feet
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Weight
71g
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Construction
Shock Resistant Carbon, Core Guard structure
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Watch Style
Diver, Fashion
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Warranty
2 Years
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Also Known As
GR-B300RY-1A9DR, GR-B300RY-1A9
Description
Introducing the Casio G-Shock GR-B300RY-1A9 Gravitymaster Men's Watch from the Master of G-Air series is built for professionals who demand performance, precision, and durability in extreme environments. Designed with rescue missions and aviation in mind, this bold timepiece features a 54.7mm case constructed from bio-based carbon and resin, providing exceptional toughness while remaining lightweight at just 71g. The sleek black case and dial are paired with a bright yellow bio-resin strap—a nod to emergency gear and high-visibility safety signals. Inspired by next-generation aircraft, the organic, seamless design of the GR-B300RY exudes modernity and functionality. Its Carbon Core Guard structure enhances shock resistance, while the wide 3D analog face ensures superior legibility in any condition. The watch features dual-time display, flight log memory, and Bluetooth® connectivity for syncing with the G-SHOCK app—perfect for travelers and pilots alike. Powered by Tough Solar, it charges via light and offers long-lasting operation without battery changes. It’s also water-resistant up to 200 meters, features a Neon Illuminator blacklight LED, and is built to withstand the harshest air and rescue conditions. With its cutting-edge tech, rugged construction, and aviation-inspired design, the GR-B300RY-1A9 is a standout tool for those who live and work at the edge. Available at Watch Zone. UPC: 4549526397936
Watch Features:
Smartphone Link/App
Connectivity Features
Mobile link (Wireless linking
using Bluetooth®)
Apps: CASIO WATCHES
App connectivity feature
Auto time adjustment
Easy watch setting
Approximately 300 world time
cities
Flight log
Phone finder
World time
Dual time (Home City time
swapping)
Stopwatch
1-second stopwatch
Measuring capacity: 23:59'59.
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 and 1-hour increments)
Alarm/hourly time signal
Daily alarm
Light
LED light (Super Illuminator)
Afterglow
Light color
LED: White
Calendar
Full auto-calendar (to year 2099)
Energy saving feature
Power Saving (hands stop to save
power when the watch is left in the dark)
Battery display/alert
Battery level indicator
Run time
Approx. battery operating time:
5 months on rechargeable battery
(operation period with normal use without exposure to light after charge)
18 months on rechargeable battery
(operation period when stored in total darkness with the power save function on
after full charge)
Accuracy
Accuracy: ±15 seconds per month
(with no mobile link function)
Other features
Date display
Day indicator
Regular timekeeping: Analog: 3 hands (hour, minute (hand moves every 10 seconds), second), 3 dials (dual time hour and minute, dual time 24-hour, day)