The Casio G-SHOCK Octagon Bluetooth Solar GBM-2100-1AER is a solar watch with extensive functionality. Its silver-colored envelope was created from fiberglass-reinforced resin and stainless steel, while the black strap is made of durable plastic. Mineral glass protects the dial, which supports functions such as Bluetooth connectivity, world time, power saving, find phone, mute, 5 daily alarms, perpetual calendar, stopwatch, timer and Super Illuminator backlight. The model features shock resistance and 200 meters of water resistance.
Functions
Bluetooth® Smart
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.
Stopwatch function - 1/100 sec. - 24 hours
Accuracy of measurement up to 1/100 of a second, measuring range up to 24 hours.
Timer - 1/1 sec. - 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. They The time can be set to the nearest second and up to 24 hours in advance.
5 daily alarms
The daily alarm reminds you about recurring events with an acoustic signal at the time you have set. This model has 5 independent alarms for flexible reminders of important appointments.
Button tones on/off
The button tones for using the mode button can be turned off. This means that the watch no longer beeps when switching from one function to another. Preset alarm or countdown timers remain active when the button tones are deactivated.
Hand Moving Function
With a push of a button, hands are moving and permit a free visibility of functions like stopwatch or date.
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.
Automatic calendar with Date, Day and Month
Once set, the automatic calendar always displays the correct date.
12/24-hour timekeeping
Times can be displayed in either a 12-hour or 24-hour format.
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 Octagon Bluetooth Solar GBM-2100-1AER (8)
The Casio G-SHOCK Octagon Bluetooth Solar GBM-2100-1AER watch is a device in which the manufacturer has brilliantly solved the power supply issue. Tough Solar technology works flawlessly, allowing the watch to constantly recharge from light, so you never have to worry about replacing the battery, which makes it incredibly convenient for everyday wear.
Quncy
4/28/26
100%
I bought this model and I'm happy with it. It looks great and feels comfortable on the wrist. I recommend it to everyone.
Fix
4/20/26
100%
The design of this series is already a classic. The comfortable black plastic strap ensures the watch sits comfortably on the wrist. The build quality is impressive. This model combines old-school style with modernity. The store really delivers.
DW260_forever
3/3/26
100%
The G-SHOCK Octagon Bluetooth Solar GBM-2100-1AER is a watch that strikes the perfect balance between rugged durability and modern style. The iconic octagonal case shape in silver looks very striking on the wrist, and the steel finish adds a touch of elegance that is sometimes lacking in purely sporty models. Despite its sturdiness, the watch is surprisingly slim (only 12 mm thick), so it fits easily under the cuff of a sweatshirt or jacket. From a user’s perspective, the biggest advantage is the combination of Tough Solar and Bluetooth. Solar power means I don’t have to worry about changing the battery at all, and syncing with my phone ensures the time is always accurate to the second. The "Find My Phone" feature has saved my morning a few times already, and the Super Illuminator allows for a very clear time reading at night. It’s simply a reliable everyday companion that can withstand almost anything thanks to its 200-meter water resistance and legendary shock resistance.
Boniek18_W
2/19/26
100%
The product meets expectations, and delivery was fast.
Kazyb
1/13/26
100%
Great product, fast shipping.
MyMilosz
12/2/25
100%
Very fast order processing.
Bartosz B.
10/30/25
100%
The watch is great! It's very durable, and the price was really attractive. I highly recommend shopping here!
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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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