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Order within 1 Hours 58 mins with Scheduled Delivery. If you place an order within this time, We will ship Monday, Jun 17 2024. This delivery time is calculated by DHL and FedEx. You can check the exact delivery date on checkout page.

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     Description (3,442 characters)

The GRAVITYMASTER GR-B300 is an aviation-themed watch from the G-SHOCK MASTER OF G series, designed for professionals working in harsh environments.

The GR-B300 is a GRAVITYMASTER that employs a shock-resistant "Carbon Core Guard" structure that takes advantage of the characteristics (shock resistance, rigidity, and deterioration resistance) of the carbon material that is also used in aircraft bodies.

The combination of a carbon fiber reinforced resin case and a seamless bezel inspired by next-generation aircraft gives the GRAVITYMASTER its powerful form.

The watch also features a flight log function that records the current location and time, and a dual time function that displays the time in two time zones simultaneously, creating a worldview reminiscent of that of aircraft and pilots.

In addition to the home time swap function, which allows you to instantly switch between your home time city and local time city by simply tapping a button on the app, the watch is also equipped with a dual time function that allows you to simultaneously display the time in two cities, which is useful when traveling abroad.

To ensure visibility, which is important during flight when intuitive reading is required, large, three-dimensional hour markers and a metal bezel that accentuates the wide face are used to enhance the sense of functionality.

In addition, a dual coil motor is used for the disk hand at 9 o'clock to improve the movement and functionality of the hand.

In addition to the alarm ON/OFF function and the rotating stopwatch, it also serves as a battery indicator.

The dial and buttons feature the high-contrast accent colors seen in aircraft cockpits, but the design is in functional dark colors.

The case, bezel, and band are made of biomass plastic, which is expected to reduce the burden on the environment.

Time correction via Bluetooth® connection ensures the time accuracy required for aviation missions, and solar power makes it practical.

GRAVITYMASTER embodies the worldview of professional aviation and the "longing for the sky," while supporting the relentless challenge to the limits.


- Shock-resistant construction
・ Tough Solar (solar charging system)
- 20 ATM water resistance
- Mobile Link function (function linkage via Bluetooth® communication with compatible mobile phones)
- Dual time (with home time swap function)
・Stopwatch (1 second, 24 hour, split)
- Timer (set unit: 1 minute, maximum set: 24 hours, measured in 1 second units)
・ Electronic alarm
- Battery indicator display - Power saving function (hands stop moving after a certain period of time in a dark place to save power)
- Fully automatic calendar
- Date and day of the week display
・ LED light (Super Illuminator, with afterglow function)
・ Operating time from full charge without solar power generation When using functions: Approximately 5 months When in power saving mode: Approximately 18 months * When not linked to a smartphone, it operates with normal quartz accuracy (average monthly difference of ±15 seconds)


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The GRAVITYMASTER GR-B300 is an aviation-themed watch from the G-SHOCK MASTER OF G series, designed for professionals working in harsh environments.

The GR-B300 is a GRAVITYMASTER that employs a shock-resistant "Carbon Core Guard" structure that takes advantage of the characteristics (shock resistance, rigidity, and deterioration resistance) of the carbon material that is also used in aircraft bodies.

The combination of a carbon fiber reinforced resin case and a seamless bezel inspired by next-generation aircraft gives the GRAVITYMASTER its powerful form.

The watch also features a flight log function that records the current location and time, and a dual time function that displays the time in two time zones simultaneously, creating a worldview reminiscent of that of aircraft and pilots.

In addition to the home time swap function, which allows you to instantly switch between your home time city and local time city by simply tapping a button on the app, the watch is also equipped with a dual time function that allows you to simultaneously display the time in two cities, which is useful when traveling abroad.

To ensure visibility, which is important during flight when intuitive reading is required, large, three-dimensional hour markers and a metal bezel that accentuates the wide face are used to enhance the sense of functionality.

In addition, a dual coil motor is used for the disk hand at 9 o'clock to improve the movement and functionality of the hand.

In addition to the alarm ON/OFF function and the rotating stopwatch, it also serves as a battery indicator.

The dial and buttons feature the high-contrast accent colors seen in aircraft cockpits, but the design is in functional dark colors.

The case, bezel, and band are made of biomass plastic, which is expected to reduce the burden on the environment.

Time correction via Bluetooth® connection ensures the time accuracy required for aviation missions, and solar power makes it practical.

GRAVITYMASTER embodies the worldview of professional aviation and the "longing for the sky," while supporting the relentless challenge to the limits.


- Shock-resistant construction
・ Tough Solar (solar charging system)
- 20 ATM water resistance
- Mobile Link function (function linkage via Bluetooth® communication with compatible mobile phones)
- Dual time (with home time swap function)
・Stopwatch (1 second, 24 hour, split)
- Timer (set unit: 1 minute, maximum set: 24 hours, measured in 1 second units)
・ Electronic alarm
- Battery indicator display - Power saving function (hands stop moving after a certain period of time in a dark place to save power)
- Fully automatic calendar
- Date and day of the week display
・ LED light (Super Illuminator, with afterglow function)
・ Operating time from full charge without solar power generation When using functions: Approximately 5 months When in power saving mode: Approximately 18 months * When not linked to a smartphone, it operates with normal quartz accuracy (average monthly difference of ±15 seconds)

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4549526373183 In Stock