G-Shock • GRB300H-5A • Gravitymaster Watch

Expand your horizons with a MASTER OF G — designed for pros working in the toughest of environments. Take the first step in a journey of endless exploration with the MASTER IN HORIZON GOLD, inspired by the golden horizon where earth meets sky. This is one tough watch built to deliver with refined style and rugged performance.

The design features a metal bezel finished in light yellow gold ion plating and key metal components accented with brown ion plating. Paired with a dark brown resin band, these timepieces project the awe-inspiring power of nature.

The GR-B300H-5A employs a shock-resistant Carbon Core Guard structure with carbon fiber-reinforced resin case and seamless bezel design inspired by next-generation aircraft, coming together in a bold and powerful form. Dual-time instantly switches between the time back home and local time, a practical function to make traveling abroad that much smoother. The large, raised indexes and metal bezel accentuating the large watch face enhance the visibility and functionality so important for pilots, whose job demands intuitive reading of time. The rotary disc indicator at the 9 o’clock position is driven by a dual-coil motor to ensure smooth rotation and functional beauty, rotates to display alarm on/off status, serves as stopwatch, and also functions as a battery level indicator.

SPECIFICATIONS

• Case size (L× W× H)
  59 × 54.7 × 15.7 mm
• Weight 71 g
• Case and bezel material Bio-based Carbon / Bio-based resin / Stainless steel
• 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)

• 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 Flight log Phone finder

• Glass Mineral Glass
• Crown Screw Lock Crown
• Surface treatment Light yellow gold ion plated bezel
• Compatible band size 145 to 215 mm
• Other Neobrite

• 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)