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G-Shock

Casio GA-B2100-1A1JF [G-Shock GA-B2100 Series Men's Rubber Band] Watch Shipped from Japan Released in Apr 2022

  • Based on 704 reviews
Condition: New
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Availability: Only 1 left in stock, order soon!
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Arrives Wednesday, Oct 21
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Description

Introducing the sleek and robust Casio GA-B2100-1A1JF, a modern take on the classic G-Shock design. This unisex watch boasts a 45.4mm x 11.9mm carbon/resin case, housing a solar-powered quartz movement with a battery life that's virtually maintenance-free. The GA-B2100-1A1JF is equipped with Casio's Tough Solar technology, ensuring it stays powered even in low light conditions. The watch features a 200-meter water resistance rating, making it suitable for swimming and snorkeling, while its shock-resistant structure provides durability for everyday wear. The GA-B2100-1A1JF also comes with Smartphone Link functionality, allowing you to connect to your smartphone via Bluetooth to receive time calibration and other useful features. The watch's modern, octagonal design is accentuated by a black resin band with a buckle closure, making it a stylish and practical choice for both men and women.

Package Dimensions ‏ : ‎ 4.41 x 3.58 x 2.52 inches; 1.83 ounces


Item model number ‏ : ‎ GA-B2100-1A1JF


Department ‏ : ‎ mens


Batteries ‏ : ‎ 1 C batteries required. (included)


Date First Available ‏ : ‎ May 13, 2022


Manufacturer ‏ : ‎ Casio


Product Warranty: For warranty information about this product, please click here


Best Sellers Rank: #30,230 in Cell Phones & Accessories (See Top 100 in Cell Phones & Accessories) #2,986 in Smartwatch Bands


#2,986 in Smartwatch Bands:


Display: Analog Digital


Watch Movement Type: Quartz


Additional Features: Shock Resistant


Power Source: Solar Powered


Strap Type: Two Piece Strap


Water Resistance Depth: 200 meters


Sport Type: Walking


Clasp Type: Buckle


Water Resistance Level: Water Resistant


Embellishment Feature: Crystal


Closure Type: Buckle


Style Name: Modern


Band Color: Black


Dial Color: Black


Theme: Sports


Face Style: Modern


Bezel Color: Black


Brand Name: G-Shock


Model Name: GA-B2100-1A1JF


Included Components: Manual


Model Number: GA-B2100-1A1JF


Series Number: 2100


Item Weight: 52 g


Global Trade Identification Number: 46


Unit Count: 1 Count


Model Series: GA-B2100


Manufacturer: Casio


Number of Items: 1


Manufacturer Part Number: GA-B2100-1A1JF


Band Material Type: Resin


Case Material Type: Carbon/Resin


Crystal: Glass


Case Diameter: 45.4 millimeters


Band Width: 26.1 millimeters


Case Thickness: 11.9 millimeters


Band Length: 20.5 centimeters


Bands: 1


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Oct 21

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Some surprises, but better than I was expecting
Edit: Well, I tried, but this watch isn't working for my daily wear. I still give it 5 stars and I am keeping it because it has a classy look and is still very usable. My problem is that I cannot see the negative display without glasses and a lot of light. I'll be getting the GA-B2100-1A for daily wear, and reserve this one for a night out on the town. This is a "first impressions" review. I'll try to update it later. I'm a 58y/o man, 6'2, 240#, so not "skinny" wrists, and my eyes aren't as good as they used to be. I say that to explain why I wanted to give this a 4 star review, but have to give it a 5 because the issues are not with the watch. I've worn a Timex Katmai combo Expedition watch for years, and remember G-Shocks as being bricks held on with ratchet straps. This one is surprisingly light, and where the Timex with the canvas strap needed to be adjusted several times throughout the day as my wrists expanded or contract, the band on this G-Shock has enough give that I haven't needed to touch it, or even think about it while I've been wearing it. I wanted the blacked out, or stealth, variant, and while I was surprised by what I got, it is what I ordered (mostly...more on that later). It is shades of black or dark grey, and very unassuming. The hands are photo luminescent (need to be charged with a flashlight, and fade quickly), and their uncharged color is a light- to medium-grey. No other parts of the watch face are luminescent, but all can be reasonably well seen when the light button is pressed. The LCD is a negative display, so the "background" is black, and the letters and numbers in the display are "not black" (not quite white, so maybe a light grey). Although the display is a little difficult for me to read "quickly", my light meter says that I'm in 8 lux of light, so any difficulties that I'm experiencing are like due to my eyes and my environment. However, when I move to a brighter setting (68 lux) the analog hands are easily read, and the LCD only takes a moment longer to read. (The feature to quckly and easily move the hands out of the way of the other displays is a very nice and welcome touch!) Also, between the reflective face of the watch, and the highly polished crystal, it does take a second to find an angle off of the light where I can read the dials and displays. The watch arrived with the battery at half-charge (indicator pointing to "M"), but from the research I've done this won't be a problem, and assuming I spend the majority of the weekend outside I should have a full charge before too long. I would note that this product is the "JF", and while the box I received says "JF", the tag on the watch is "ER". This doesn't seem to have made any difference in the functionality, and after watching other un-boxing videos I do think this was opened and repackaged (although there is no sign of wear and tear on the watch, can, box, or documentation). The blue-tooth app for my phone made this watch easy to configure, which was a real joy because I was dreading setting everything up on the watch itself. The two recommendations I would have for Casio would be to ( 1 ) black out the control buttons and screws on the sides of the case (the buckle is a strong plastic instead of shiny steel, it would be good if the buttons were too), and ( 2 ), even though this is a stealth model, make the hands a little more visible with either a true white luminescent paint, or just white and let the onboard light be used in no-light conditions. Overall, I do highly recommend this watch for daily wear given it's durability, usability, and capabilities. ... show more
Reviewed in the United States on September 15, 2023 by Chuck B
    • Great watch for restaurant work
Review Image by Andy
Review Image by Andy
I work in a restaurant, so I specifically bought this watch to help me keep track of timing during work. I’ve been using it for about a week, and so far I’m very impressed. My hands and watch get splashed with water every day, especially when I’m washing my hands or working around the sink. When I’m busy, the watch also gets bumped against things from time to time. So far, it has handled everything without any problems. The water resistance is probably my favorite feature. I can simply rinse the watch with water when I’m washing my hands, and I don’t have to worry about it. It’s very convenient for my job. I also really like the Bluetooth feature. I can connect it to my phone and use the app to set alarms and timers for work. It makes keeping track of food and order times much easier. I’ve heard for a long time that Casio G-Shock watches are tough and built to last, and after using this one at work, I can definitely see why. It’s simple, durable, and practical. For anyone who works in a restaurant or another job where the watch gets wet and takes a few bumps, I highly recommend it. ... show more
Reviewed in the United States on September 15, 2026 by Andy
    • Perfect every day watch
Perfect every day watch. Great quality at this price point.
Reviewed in the United States on September 22, 2026 by Thomas McKenzie
    • Once you GShock you can’t stop?!
I’m late to the watch game and this will be my 5th watch overall and 1st GShock. I’ve seen GShocks before in stores but I didn’t really pay attention to them that much, big mistake, I’ve been missing out! After researching GShocks I really appreciate how rugged they are and how long lasting they can be. So I went ahead and ordered this all black Casioak with Bluetooth and Solar charging. I think I would’ve been ok with just a regular Casioak but having Solar and a few features via Bluetooth for a few bucks more is ok for me too. I don’t follow trends and hype much, I read these were very popular when they first came out, they’re still popular now. These just look very attractive to me so that’s why I chose it. Although I like its form factor, functionality could have been better. It really can be hard to read at first glance. I’ve been rocking an Amazfit Bip Smartwatch for years, for work for hiking, everything is so easy to read right away. So this being my first Casioak and going back to analog may take some time to get use to. My ideal watch would be a Casioak form factor with touchscreen and fitness health tracking, but this is just a dream for now. I have Garmin Instinct in mind and I also like the DW-H5600 and GDB-200 options too. I really just learned about these watches recently and that’s because of me researching Casios. If only Apple Watches had official GShock watch faces, I would get my first Apple Watch ha. Anyway I plan to wear this Casioak daily when going out and getting the kids from school but may stick to my Amazfit as a beater work watch. I actually also got a screen protector for this because I want it to last longer than long! But those other cheaper GShocks are nice too and can be my beater work watch. So many choices. ... show more
Reviewed in the United States on June 4, 2024 by Carlos
    • Giving it four stars was a stretch.
It takes a lot to figure this watch out. Buttons are hard th press. Difficult to read the all black version and the light is poorly designed. Illuminates only one corner of the face. The light button should be better design and the light should illuminate the entire face like some of there other watches. ... show more
Reviewed in the United States on August 28, 2026 by John Besenhofer
    • Great watch!
Can’t go wrong with a GShock!
Reviewed in the United States on August 30, 2026 by Joel Dean
    • Casio GAB 2100
This is a good quality very durable and good looking watch. I also love the Bluetooth feature, but what can I say? It’s a Casio highly recommended worth every penny.
Reviewed in the United States on May 24, 2026 by Tommy harper
    • Very nice watch, just not for me
The Casio G-Shock GA-B2100 is a very nice watch. It has a decent size to it, though smaller than a lot of other G-Shock models. It isn't a very heavy watch, so it makes it very easy to wear all day long. The Bluetooth works great on this model. It takes a little bit of time to get it fully charged (8-10 hours of direct sunlight if it is on low battery), but once fully charged it keeps its charge. The issue that I had with this model is that the visibility of it is not what I was expecting. With the black background and dark grey hands, it can be very hard to read in low-light conditions. The small digital screens are also very hard to read. If the LED lighting were moved to a different spot (possibly the top or bottom of the face) it would be a little easier. I was expecting more from Casio on this one. I would rate this watch a 6/10 just because of the visibility issues alone. ... show more
Reviewed in the United States on July 23, 2026 by J's Reviews

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