Whatever you do, wherever you are, with G-SHOCK Master of G you’ve got your back.
Based on the GRAVITYMASTER, MUDMASTER and MUDMAN models that offer optimal performance in extreme conditions in the air and on land, this line features a black case that symbolizes ruggedness, with details in bright emergency colors that recall the world of professionals engaged in operations rescue and other critical missions.
The organic shape of the GRAVITYMASTER GR-B300EC is inspired by next-generation aircraft and rendered through a uniform design. The Carbon Core Guard structure and large 3D surface ensure durability, readability and a comfortable fit. You can also enjoy all the practical features, including simultaneous dual time display in two cities, a flight log memory function to record routes taken, and much more.
Case dimensions (H x W x D)
59 × 54.7 × 15.7 mm
Weight
71 g
Case and bezel material
Bio-based carbon/Bio-based resin/Steel stainless
Strap
Bio-based resin strap
Structure
Shock resistant
Carbon Core structure Guard
Water resistance
Water resistant up to 20 bar
Time adjustment
Bluetooth: yes connects to a smartphone and automatically adjusts the time
Power and battery life
Tough Solar (solar powered)
Smartphone connection function
h2>Mobile Link (wireless connection via Bluetooth®)
App
CASIO WATCHES
Connection function to the app
Automatic clock adjustment
Easy clock setting
World time in approximately 300 cities
Flight log
div>Find phone
Glass
Mineral glass
Crown
Crown with clasp screw
Surface treatment
Black ion plating bezel
Adjustable strap
From 145 to 215 mm
Miscellaneous
Neobrite
World Time
Second time zone time (home city switching time)
Stopwatch
1 second stopwatch
Measuring capacity: 23:59’59.
Measurement mode: elapsed time, split time
Timer
Countdown timer
Unit of measurement: 1 second
Countdown interval: 24 hours
Countdown start time setting range: 1 minute to 24 hours (1 minute increments and 1 hour increments)
Audible Reminder / Time Signal
Audible Reminder daily
Light
LED light (Super Illuminator)
Luminescence
Light color
LED: White
Calendar
Full automatic calendar (up to the year 2099)
< h2>Energy saving function
Energy saving (hands stop to save energy when the watch is left in the dark)
Display/alert of the battery status
Battery level indicator
Ride timing
Approximate battery run time:
5 months with rechargeable battery (operation period for normal use without exposure to light after charging)
18 months with rechargeable battery (operating period when stored in total darkness with the energy saving function activated after a full charge)
Accuracy
Accuracy: ±15 seconds per month (without Mobile Link function)
Other features
Date display
Date
Regular timekeeping:
Analog: 3 hands (hour, minute (with hand moving every 10 seconds), second), 3 dials (second time hours and minutes, second time 24 hours, day)
GR-B300EC-1A
Case dimensions (H x W x D)
59 × 54.7 × 15.7 mm
Weight
71 g
Case and bezel material
Bio-based carbon/Bio-based resin/Steel stainless
Strap
Bio-based resin strap
Structure
Shock resistant
Carbon Core structure Guard
Water resistance
Water resistant up to 20 bar
Time adjustment
Bluetooth: yes connects to a smartphone and automatically adjusts the time
Power and battery life
Tough Solar (solar powered)
Smartphone connection function
h2>Mobile Link (wireless connection via Bluetooth®)
App
CASIO WATCHES
Connection function to the app
Automatic clock adjustment
Easy clock setting
World time in approximately 300 cities
Flight log
div>Find phone
Glass
Mineral glass
Crown
Crown with clasp screw
Surface treatment
Black ion plating bezel
Adjustable strap
From 145 to 215 mm
Miscellaneous
Neobrite
World Time
Second time zone time (home city switching time)
Stopwatch
1 second stopwatch
Measuring capacity: 23:59’59.
Measurement mode: elapsed time, split time
Timer
Countdown timer
Unit of measurement: 1 second
Countdown interval: 24 hours
Countdown start time setting range: 1 minute to 24 hours (1 minute increments and 1 hour increments)
Audible Reminder / Time Signal
Audible Reminder daily
Light
LED light (Super Illuminator)
Luminescence
Light color
LED: White
Calendar
Full automatic calendar (up to the year 2099)
< h2>Energy saving function
Energy saving (hands stop to save energy when the watch is left in the dark)
Display/alert of the battery status
Battery level indicator
Ride timing
Approximate battery run time:
5 months with rechargeable battery (operation period for normal use without exposure to light after charging)
18 months with rechargeable battery (operating period when stored in total darkness with the energy saving function activated after a full charge)
Accuracy
Accuracy: ±15 seconds per month (without Mobile Link function)
Other features
Date display
Date
Regular timekeeping:
Analog: 3 hands (hour, minute (with hand moving every 10 seconds), second), 3 dials (second time hours and minutes, second time 24 hours, day)
GR-B300EC-1A
