The watch is equipped with energy-saving Bluetooth® technology, which offers power-saving data transfer at the push of a button. The watch can connect to a smartphone wirelessly via Bluetooth®, enabling access to a wide range of useful functions.
Super-Illuminator
At the touch of a button, the display can be brightly illuminated in a fashionable color
Shock-resistant
Shock-resistant construction protects against impact and vibration.
Solar Power
A solar cell provides power for operation.
Neo-display
A luminous coating provides long-term illumination in the dark after only a short exposure to light.
World time function
Displays the current time in major cities and specific areas around the world.
Date and weekday display
The current day and weekday are both displayed.
Stopwatch function - 24 hours
Elapsed times are measures with split-second accuracy. The watch can measure times of up to 24 hours.
Timer - 1/1 min. - 24 hours
For fans of precision: the countdown timers help you to remember specific or recurring events by giving off an audible signal at a preset time. The time can be set to the nearest seconds and up to 24 hours in advance. This model has three independent timers - ideal for people who need to take medicines every day or those who do interval training.
Daily alarm
The daily alarm reminds you of events that recur every day, by emitting an audible signal at the set time.
Crown button lock
Secures the crown button from accidental change to another mode of operation.
Phone Finder
Misplaced your smartphone? All it takes is the push of a button on your watch and the smartphone sounds an alarm.
Flight Log Memory
The product is equipped with Flight Log Memory.
Mineral glass
The tough mineral glass resists damages.
Folding clasp
The watch has a folding clasp.
Battery level indicator
An indicator shows the current battery level.
Water resistance classification (20 bar)
Perfect for free diving without scuba gear: the watch is water resistant up to 20 bar according to ISO 22810.
What’s in the box?
3-year warranty
User manual
Warranty card
Casio box
Reviews about G-SHOCK Gravitymaster Bluetooth Tough Solar GR-B300-1AER (10)
This model really catches the eye with its carbon case. It has the feel of Casio's legendary series. I highly recommend it.
Ludwikf
3/13/26
100%
The Casio G-SHOCK Gravitymaster GR-B300-1AER is a watch that makes an incredible impression with its design and advanced features. I chose it primarily because of its solar power—Tough Solar is a key feature for me, as it completely eliminates the need to replace the battery, which is extremely convenient given the watch’s many functions. The steel-reinforced carbon case makes the watch relatively lightweight despite its substantial size, while also making it nearly indestructible. Bluetooth Smart connects instantly to your phone, allowing for automatic time synchronization and easy configuration of alarms or world time via the app. This is a professional tool that, thanks to its water resistance up to 200 meters and shock-resistant system, performs well in all conditions, even the most extreme.
Zbigniew, łodzianin
3/13/26
100%
I bought this G-Shock model for myself and I'm very happy with it. The option to order it as a gift is a great feature of the store. Everything went smoothly.
Makary
2/13/26
100%
Excellent service, fast shipping.
Robsonx.
1/4/26
100%
Fast shipping, as described.
Jagoda Janicka
11/18/25
100%
I received this watch as a gift. The solar-powered mechanism is really practical and precise. The Japanese quality is evident in every detail. I'm very satisfied.
Wojciecht.
11/14/25
100%
Great product, fast delivery.
Emilka IBC.
10/27/25
100%
It’s quite large—which is noticeable—but even so, I don’t find it uncomfortable to wear on my wrist all day. The watch collects light and allows you to use it without having to replace the battery frequently, which is a very convenient solution. The dial was designed with pilots in mind, so the large hour markers, layered dial design, and good contrast really do the trick. In practice, even in low light, the Super Illuminator backlight works well, and I could read the time without any trouble during an evening walk.
I definitely recommend it. I’m very happy with my purchase and the fast order fulfillment.
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The administrator of your personal data is the owner of the Watchard store, i.e. 57 Concepts Sp. z o.o. Sp. k. with the registered office at al. Witosa 31, lok. 115, 00-710 Warsaw, Poland. Providing personal data by the Customer is voluntary but necessary to complete the purchase. You have the right to view your personal data we have processed, as well as the right to request changes or removal of your personal data. Personal data will be processed for a period of 10 years.
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The administrator of your personal data is the owner of the Watchard store, i.e. 57 Concepts Sp. z o.o. Sp. k. with the registered office at al. Witosa 31, lok. 115, 00-710 Warsaw, Poland. Providing personal data by the Customer is voluntary but necessary to complete the purchase. You have the right to view your personal data we have processed, as well as the right to request changes or removal of your personal data. Personal data will be processed for a period of 10 years.
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