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⌚ Stay ahead of time and trends with Casio G-Shock’s smart solar power!
The Casio Men Analogue-Digital G-Shock GA-B2100-1AER is a cutting-edge, solar-powered watch featuring Bluetooth connectivity for seamless phone syncing, world time for global travelers, and a durable yet lightweight resin build with 200m water resistance. Designed for the modern professional, it offers multifunctional alarms, stopwatch, calendar, and a sleek black aesthetic, all backed by a 2-year warranty and delivered in an original gift box.










| ASIN | B0B1Q5R5GQ |
| Age Range Description | Adult |
| Band Colour | Black |
| Band Length | 21.5 Centimetres |
| Band Material Type | Resin |
| Band Width | 24 Millimetres |
| Bands | 1 |
| Best Sellers Rank | 35,472 in Fashion ( See Top 100 in Fashion ) 154 in Men's Wrist Watches |
| Brand Name | Casio |
| Case Diameter | 46 Millimetres |
| Case Material Type | Resin |
| Case Thickness | 11 Millimetres |
| Character | Does not apply |
| Clasp Type | Without folding snap closure |
| Closure Type | Buckle |
| Crystal | Mineral Glass |
| Customer Reviews | 4.7 out of 5 stars 597 Reviews |
| Dial Color | Black/White |
| Display | Analog |
| Embellishment Feature | Crystal |
| Face Style | strip |
| Global Trade Identification Number | 04549526322884 |
| Included Components | 1 item |
| Item Shape | Round |
| Item Type Name | Watch |
| Item Weight | 80 Grams |
| Manufacturer | Casio |
| Manufacturer Part Number | GA-B2100-1AER |
| Model Name | GA-B2100-1AER |
| Model Number | GA-B2100-1AER |
| Pattern | Camouflage |
| Power Source | Solar Powered |
| Series Number | 2100 |
| Special Features | Alarm, Bluetooth, Solar Powered, Stop Watch, World Time |
| Sport Type | Other Sports |
| Strap Type | Plastic strap |
| Style Name | sporty and modern |
| Theme | Sporty Modern |
| Warranty Type | Limited |
| Watch Movement Type | Quartz |
| Water Resistance Level | Not Water Resistant |
G**N
Very good.
The bluetooth tech is actually handy, one press "D" button will synch with your phone, or automatically. The find phone function actually works (within bluetooth range), but you must have location on as well. To use these functions you need the G-Shock app on your phone. A little setup required, and one of the handiest elements of the App is you can use it to change settings on your watch (and on the watch itself as usual of course), and there is always access to the watch manual. Comfortable to wear and light. Solar powered, so no battery replacements, 200m WR, timer, stop watch 5 alarms, hourly signal, world time, backlight. The visibility of the analogue is great, the digital a little small. perfect size, and not gigantic like other g-shocks. Would recommend one of the after market Nato straps, looks good with this watch (and is compatible with the 5600s as well). Highly recommended. One small gripe, in time mode you can switch the digital read out, to the time, date/month, or day, while the upper readout stays on seconds. You can't have date/month and day (be good on the upper display). But a minor gripe on a comfortable, light and compact watch.
T**.
A Casio classic 👍
Really pleased with this watch. The GA-B2100 keeps the classic G-Shock look but feels lighter and more refined on the wrist. The solar charging is a big plus, and the timekeeping is spot on, especially when paired with the app for automatic updates. Build quality is excellent as expected from G-Shock—tough, reliable, and suitable for everyday wear. The Bluetooth features are useful for quick setup and adjustments, though the watch works perfectly well on its own too. Overall, a great balance between traditional durability and modern convenience. Highly recommend
P**L
Tough, sturdy watch. Syncs time from your phone
Very sturdy. No issues with charging, stays fully charged with some outdoors activities. Syncs the time with your smart phone rather than a radio signal.
G**R
Amazing modern timepiece
God-tier Casio! Honestly though, great watch, strap is ok, and is extremely clear to read. The led light is bright, with a clear white colour, so not like an F91w! The size is perfect too. Excellent timekeeping with the movement. Although thought it a gimmick, the ‘find my phone feature’ has already been game changing, as I was working in a loft, had put it down with no mobile signal and was able to find it easily using this feature.
J**B
Fantastic value, and will last you forever with care ( or even without care!)
Upfront confession. I'm a gshock fan. That said, I'll try to highlight both negatives and positives for this watch. So here goes. First off, ALL gshocks are fantastic value for what you get. Even the stupidly expensive ones are fantastically well built, although for me the whole point is that you should be able to subject the watch to all kinds of abuse, and then shake your head in wonderment at the fact that it keeps working! Moving on to this particular model Size - feels much smaller on the wrist than most gshocks, which is a big plus for me. I want all the gshock features, but I don't want to go to the shops looking like a navy seal! The downside to this is that the digital display panel is quite small, and if your vision is poor you may struggle. This model has the positive display, by the way, which I find much easier than the blacked out versions. Strap - the silicone strap is typical gshock, and it works absolutely fine, IF you like silicone straps. I don't. The good news is that you can buy a simple adapter, so I now have black and brown leather nato straps which I alternate according to my mood. If I go snorkeling, I can easily switch back to the silicone, because the changeover is very simple. Lume - lume is okay, but not as strong as some other gshocks. You get a backlight, though, so it's not really a problem. Timekeeping- nearly 2 years in and perfect. I personally don't like Bluetooth as much as the multiband 6 system, because I have to make the watch sync to my phone, rather than automatic updates, but in reality the thing is so accurate that it doesn't matter if you go months without syncing. Controls- simple and intuitive, and does everything you expect from top end gshocks. Summary - buy one! If you get the right deal, it can be under a hundred quid, and for that you get a super accurate, super durable watch that looks great for sports day to day and even dress wear at a pinch!
L**N
Great looking watch for the money
Lovely watch for the money this is my second G-Shock watch I've had the other one 25 years never changed the rechargeable battery as been a great watch I still ware it a lot. Fancied a new one let's hope this one is as good?
M**K
Good watch
Had this for 5 to 6 weeks now and pleased with it. Had a casio digital negative display but as as getting older having trouble seeing time without glasses. So have this analog now. Using bluetooth to phone app working fine and updates 4 times in 24hrs if in range of phone so time accurate.
K**T
Great watch
Great watch
O**E
Ömürlük
Japon kalitesi. Ömürlük bir saat.
D**E
Belle montre
Bon produit dommage que l’emballage n’était pas terrible mais bon moins cher sur Amazon qu’en boutique alors mon petit porte monnaie ce porte mieux.
S**.
امتلك اكثر من ١٧ ساعه من casio
شعرت بارتباط عاطفي مع هذه الساعه متانه و فخامه و شكل لا يمل منه
C**N
Relojazo
No puedo decir mucho más. Es lo que esperaba y lo que Casio suele dar, bastante calidad a un precio muy razonable. Vino todo en perfectas condiciones. Se configura muy fácilmente desde la app. Es ligero y cómodo.
J**T
Did not work
Did not work but can't return because of Canada Post Strike in Canada.
Trustpilot
1 month ago
3 days ago