

🕶️ Own time, own style — the G-Shock that keeps pace with your hustle.
The Casio G-Shock GA-2100-1A4ER is a 45mm men’s analog-digital quartz watch featuring a shock-resistant resin case reinforced with carbon core technology. It offers a stopwatch, alarm, day-date calendar, and world time across 29 zones. With 200m water resistance and luminous orange hands, it’s engineered for durability and visibility in any setting. Powered by a lithium battery lasting approximately 3 years, this lightweight 52g timepiece blends rugged functionality with sleek design, ideal for professionals who demand reliability and style.
| ASIN | B09T6QZCS3 |
| Batteries | 1 Lithium Metal batteries required. (included) |
| Best Sellers Rank | 57,955 in Fashion ( See Top 100 in Fashion ) 308 in Men's Wrist Watches |
| Country of origin | Japan |
| Customer reviews | 4.4 4.4 out of 5 stars (771) |
| Date First Available | 23 Feb. 2022 |
| Department | Men's |
| Is discontinued by manufacturer | No |
| Item model number | GA-2100-1A4ER |
| Manufacturer | Casio |
| Product Dimensions | 40 x 47 x 23 cm; 51 g |
J**M
Great watch
It’s a great watch god value
G**.
Really lovely and good for the price
So nice my partner so loved it
A**R
Good first watch
Bought for my 11 Yr old, seems pretty rugged. The settings are pretty easy to use. No complaints from them so far. I like the combination of analogue and digital. Have to see how long the battery lasts
Z**A
Great watch
For a G Shock it's a slim watch and looks good. The red is not as bright as it looks in the pictures. Same old Casio g shock rigmarole to set the time. That can be annoying to a new user. To be quite honest the digital read out is useless because of the size. The packaging is a cardboard box not the tin of old. All in all it's a decent casioaks watch.
L**G
Fake.
Fake watch.
C**S
Horrible dark watch
Casio make a lot of G-Shocks including this one Ga-2100. Mostly known as the Casioaks (don’t know why), they have a good reputation for 200m water resistance, stopwatch, countdown timer, world clock and an incredible backlight. This one however is too dark to really see the digital display because it’s what they call a negative display. Why did I buy it? So I could strip out the insides and put a decent movement inside. The Casio AQ-S800 which is a better watch because it’s solar powered and you can see the face too.
T**N
Can't beat a g shock watch
Excellent g shock watch ⌚️
D**G
A very nice compact G-SHOCK
The watch arrived well packaged. Out of the box the watch looks good and after a few days the strap has softened nicely. The instructions are not particularly helpful and I watched a youtube video to set the time etc. I've always had cheap casios which have been great so had no worries about the quality of the watch. This is not a typical bulky looking G-SHOCK which is what I wanted.
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