Casio G-SHOCK Master of G GRAVITYMASTER Men's Watch GRB300-1A

The sky’s the limit! Introducing the GRAVITYMASTER GRB300, a piece of aviation-inspired professional gear designed to work even in the harshest environments, from the G-SHOCK MASTER of G line. The GRB300 features a Carbon Core Guard structure, which delivers the shock-resistance, rigidity, and corrosion-resistance of carbon material used in aircraft fuselages. The carbon fiber-reinforced resin case and the seamless bezel design inspired by next-generation aircraft come together in a bold and powerful form. Envision the world through a pilot’s eyes with the flight log memory function for recording current location and time, as well as dual-time simultaneously displaying the time in two time zones. In addition, simply tap on the app to instantly switch between the time back home and local time — a practical function to make traveling abroad that much smoother. Large, dimensional index marks and a metal bezel accentuating the large watch face exude functionality, enhancing the visibility that is so important for pilots, whose job demands intuitive reading of time. The rotary disc indicator at the 9 o’clock position uses a dual-coil motor to ensure smooth rotation and functional beauty. The indicator not only rotates to display alarm on/off and stopwatch; it functions as a battery level indicator as well. The high-contrast black and white color scheme dotted with color accents on the dial and buttons evokes the look of a cockpit instrument panel, while dark color variations express the practical functionality of an aviation worldview. Key resin components used in the case, bezel, and band are made with bio-based resin, a material expected to help reduce environmental impact.

Basic Information

• Case size (L× W× H) 59 × 54.7 × 15.7 mm
• Weight 71 g
• Case and bezel material: Carbon / Bio-based resin
• Band: Bio-based resin band
• Construction: Shock Resistant, Carbon Core Guard structure
• Water resistance 200-meter water resistance
• Time adjustment: Bluetooth: Connects to a smartphone and automatically adjusts the time
• Power supply and battery life: Tough Solar (Solar powered)

Exterior

• Glass Mineral Glass
• Crown: Screw Lock Crown
• Compatible band size: 145 to 215 mm
• Other: Neobrite

Smartphone Link/ Apps connectivity feature

• Smartphone Link feature: Mobile link (Wireless linking using Bluetooth®)
• Apps: CASIO WATCHES
• App Connectivity feature: 
  Auto time adjustment
  Easy watch setting
  Approximately 300 world time cities
  Phone finder

Watch Feature

• 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)

Mute feature

• Button operation tone on/off

Energy saving feature

• Power Saving (hands stop to save power when the watch is left in the dark)

Battery display/alert

• Low battery alert

 Accuracy

• Accuracy: Accuracy: ±15 seconds per month (with no mobile link function)

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)

 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)