Whatever you're doing, wherever you are the G-SHOCK Master of G line has your back.

For total support in the harshest environments, this GRAVITYMASTER watch delivers peak performance in punishing conditions in air. It features bold black to exude toughness and a band in the same bright yellow used for emergency rescues and safety signs. This innovative design is a sure fit for the world of professionals involved in rescue efforts and other critical missions.

The organic form of the GRAVITYMASTER GR-B300RY is inspired by next-generation aircraft and rendered with a seamless exterior design. The Carbon Core Guard structure and wide 3D face deliver durability, readability, and a comfortable fit. Enjoy all the practical functions as well, including dual-time simultaneously showing the time in two cities, a flight log memory function for recording routes traveled, and more.

This tough watch delivers what you need to make quick decisions and take decisive action in the harshest of environments.

• Case / bezel material: Bio-based Carbon / Bio-based resin / Stainless steel
  
• Bio-based resin band
  
• Mineral Glass
  
• Black ion plated bezel
  
• Neobrite
  
• Shock Resistant
  
• Carbon Core Guard structure
  
• Screw Lock Crown
  
• 200-meter water resistance
  
• LED light (Super Illuminator)
  
• Afterglow
  
• LED:White
  
• Tough Solar (Solar powered)
  
• Mobile link (Wireless linking using Bluetooth®)
  
• Dual time (Home City time swapping)
  
• 1-second stopwatch
  
• Measuring capacity: 23:59'59.
  
• Measuring modes: Elapsed time, split time
  
• 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)
  
• Daily alarm
  
• Battery level indicator
  
• Power Saving (hands stop to save power when the watch is left in the dark)
  
• Full auto-calendar (to year 2099)
  
• 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)
  
• Accuracy: +/-15 seconds per month (with no mobile link function)
  
• 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 totally darkness with the power save function on after full charge)
  
• Size of case : 59 x 54.7 x 15.7 mm
  
• Total weight : 71 g