

⏳ Own Every Second, Anywhere, Anytime
The Casio G-Shock GA-100B-4AER is a rugged, 51mm analog-digital watch featuring 200m water resistance, a 1/1000th second stopwatch, world time, and up to 5 alarms. Designed with a durable resin case and bold red resin strap, it combines high-performance functionality with standout style, perfect for professionals who demand precision and versatility in any environment.







| ASIN | B005FEY8YK |
| ASIN | B005FEY8YK |
| Age Range Description | Adult |
| Band Colour | Red |
| Band Material Type | Resin |
| Band Width | 22 Millimetres |
| Bands | 1 |
| Batteries | 1 Lithium Metal batteries required. (included) |
| Best Sellers Rank | 89,413 in Fashion ( See Top 100 in Fashion ) 524 in Men's Wrist Watches |
| Brand Name | Casio |
| Case Diameter | 51 Millimetres |
| Case Material Type | Resin |
| Case Thickness | 15 Millimetres |
| Character | Fashion |
| Clasp Type | Buckle |
| Closure Type | Magnetic |
| Country Of Origin | China |
| Country of origin | China |
| Crystal | Crystal |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,749) |
| Customer reviews | 4.6 4.6 out of 5 stars (1,749) |
| Date First Available | 1 Aug. 2011 |
| Department | Men's |
| Dial Color | Black |
| Display | Analog-Digital |
| Face Style | Classic |
| Included Components | 1 package |
| Is discontinued by manufacturer | No |
| Item Shape | Round |
| Item Type Name | Watch |
| Item Weight | 70 Grams |
| Item model number | GA-100B-4AER |
| Manufacturer | CASIO |
| Manufacturer | CASIO |
| Manufacturer Warranty Description | 2 years |
| Model Name | GA-100B-4AER |
| Model Number | GA-100B-4AER |
| Pattern | Solid |
| Power Source | Battery Powered |
| Product Dimensions | 5.51 x 1.7 x 5.13 cm; 70 g |
| Sport Type | Other Sports |
| Strap Type | Plastic strap with buckle |
| Style Name | Bracelet |
| Warranty Type | Manufacturer |
| Watch Movement Type | Quartz |
| Water Resistance Depth | 200 Metres |
| Water Resistance Level | Waterproof |
C**E
A quality watch
Bought as present...quality watches
W**D
Whaleoilbeefhooked
Beautiful....
C**E
Great watch great value
A great robust watch for someone who likes something a little bit different. Bought in red, which isn't as bright as the picture but a nice pillar box red nonetheless. In some respects a 'neutral' colour that can be worn with any outfit. Substantial watch with chunky face and good solid strap. Comes in a great presentation tin within a box. Made a fantastic present. Great value (£49.99) for a good reliable brand which can withstand the knocks of everyday life.
J**N
Great value, tough as nails every day watch.
Managed to grab the red one for just under £46 which I think is a bargain. These are regularly priced between £65 and £110 online at the moment. Bear in mind that this is a fairly old model so it’s worth looking to get this for the best price as there are new g shocks with better features such as solar power and atomic clock syncing etc for similar prices. Let’s get the cons out of the way first. Visibility isn’t great as some reviews have said, the LCD’s are difficult to see in anything other than good daylight conditions. The red hour hand also makes it difficult to pick up the time unless the light is good and the backlight in the dark doesn’t really help that much. You can’t see the LCD’s when it’s dark at all. This isn’t so much a con but you need to know that this is a big watch so for smaller people or those with a small wrist, you might look like you’re wearing a Lifebuoy ring on your wrist. Now for the pros. This is a watch to be worn and worn out in testing conditions. Buy this, do whatever you like wearing it and you’ll probably never break it. This is it’s main selling point in my opinion. It has pretty much all of the features you could need for day to day use, time, auto calendar, world time, stopwatch with lap and split, speed calculator, countdown timer with repeat, multiple alarms with snooze. I think this makes a great every day work or exercise watch that you can throw on or off as you need, knowing that you’re only going to have to check and update the time once a month or so and change the battery every two years. Some people have commented that this is difficult to set and operate but this isn’t the case. My tip here is to ignore the instruction booklet and do a quick YouTube search of the model number and you’ll have it set up in a minute or two without any fuss at all. There are also some reviews saying this is a fake but there’s nothing to indicate that it is fake at all. The auto light feature works perfectly, something which I’m told doesn’t work with a fake g shock. Also, on lots of fake versions of this model, the top left LCD wheel is split into three segments, whereas on the real watch (and on mine) all four segments are present and correct and all work exactly as they should. Another common issue with fakes is that the needle in the top middle window is stuck at the twelve o’clock position, whereas on this watch the needle is set by default to zero and works perfectly when the stopwatch or speed calculator is used, resetting back to zero exactly as it should. So I’d say buy with confidence. If you’re interested, keep your eye on the price of this and other g shocks as they occasionally fluctuate and you may well be able to grab this at a better price if you sit tight.
B**I
A proper bloke's watch with a hint of gaiety
Perfect red with a satin matt finish. Lightweight & comfortable. I am blessed with 9 inches (of wrist size) & it fits on the last pair of holes but looks aok in the hasp & a millimeter of strap still comes through after the securing band is pulled round. Very easy to set up, the easiest Casio I have in fact. Bright silver digits in black LCD displays are perfect. One tiny issue, the hour hand is red with the minute hand white & this makes for a little extra looking to spot it. Only the red does this by the looks of other colours I have looked at.
S**S
Forget this watch if you need to see the time with the built in light
I love G-Shock watches but was disappointed with this one. Build quality was 5* as usual as was everything apart from one very important for me operation. At night when i pressed the light it was very difficult to clearly see the time. When i sleep and wake and want to see the time i want a quick glance at the time and fall back to sleep. With this watch i couldn't do that and that was enough to change it for a different model.
M**N
Casio made very good quality watches
Casio made very good quality watches. I have purchased the red colour version and have been very pleased with it since day one. The watch is very accurate and it also comes with a small amber LED light to see the time at night (I know some reviews said the LED is poor but my honest opinion is it does the job and you can see the time in darkness). The watch is totally water proof and cold weather proof. I have done a weather test myself by leaving it in a bucket overnight as well as leaving it inside my freezer for 24hr. The watch survive in both tests and I have attached photos for your reference. Very happy with the product and I would definitely recommend it to anyone who is looking for a sporty looking, strong and reliable watch.
Y**S
Another good addition to my G Shock collection
Another good addition to my G Shock collection. Nothing bad to say about the watch, does what is says on the tin. I'm finding the [very]small print of the handbook difficult to read with failing vision. Casio Customer Services talked me through the set up and in future I'll be straight on to them. Took me a while to find the correct number, so for others with similar issues with the small print, here is the number to dial for help:- 0202 8450 9131 Great watch, good price and speedy delivery. A cracker :-)
V**.
Muy bueno! Ha sido un regalo y acertado
A**ー
大変デザインが良いので気に入りました。また良いデザインがあれば購入します。
P**S
Came in a small cloth bag inside a cardboard box rather than the nice metal case pictured in ad that I would be used to with G-Shock watches. Colour is also a much flatter Matt red than pictured. Had I seen it in the flesh before purchasing I’d probably have chosen something else. Watch itself colour issue and box aside is nice. Delivery time was good, a day earlier than predicted.
R**T
Just what i need a sporty watch
B**N
Klockan är ok dock är det ej samma aska som visas på bilden ? varför ej detta och asken var ej inplastad så verkar var en klocka som gått i retur
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