G-Shock Bluetooth Casioak Watch GA-B2100-1A1
Uncompromising Strength Meets Sophisticated Design Experience the perfect blend of style, functionality, and durability with the G-Shock CasiOak Carbon Core Guard GA2100-1A1. As an illustrious heir of the original DW-5000C introduced in 1983, this watch evokes G-SHOCKās timeless appeal while pushing the boundaries of resilience. Signature Octagonal Form This model sports the unique octagonal shape reminiscent of the pioneering DW-5000C. The classic analog-digital timekeeping is seamlessly integrated into a straightforward, clutter-free design, without compromising the iconic G-SHOCK toughness. Thin Yet Robust With the high-strength resin material reinforced with carbon fibers, this watch boasts an impressively thin case. At just 11.8 mm, it stands as the thinnest among G-SHOCK combination models, offering a sleek profile without sacrificing robustness. Featuring the exclusive Neobrite technology, the GA-2100-1A and GA-2100-4A models deliver enhanced visibility in low-light conditions. Carbon Core Guard Structure The innovative carbon core guard structure provides advanced protection to the module. By enclosing it in a carbon case, the watch gains exceptional strength, crack resistance, and durability. This case is constructed with fine resin infused with carbon fibers, affirming the watch's commitment to enduring toughness.
Uncompromising Strength Meets Sophisticated Design Experience the perfect blend of style, functionality, and durability with the G-Shock CasiOak Carbon Core Guard GA2100-1A1. As an illustrious heir of the original DW-5000C introduced in 1983, this watch evokes G-SHOCKās timeless appeal while pushing the boundaries of resilience. Signature Octagonal Form This model sports the unique octagonal shape reminiscent of the pioneering DW-5000C. The classic analog-digital timekeeping is seamlessly integrated into a straightforward, clutter-free design, without compromising the iconic G-SHOCK toughness. Thin Yet Robust With the high-strength resin material reinforced with carbon fibers, this watch boasts an impressively thin case. At just 11.8 mm, it stands as the thinnest among G-SHOCK combination models, offering a sleek profile without sacrificing robustness. Featuring the exclusive Neobrite technology, the GA-2100-1A and GA-2100-4A models deliver enhanced visibility in low-light conditions. Carbon Core Guard Structure The innovative carbon core guard structure provides advanced protection to the module. By enclosing it in a carbon case, the watch gains exceptional strength, crack resistance, and durability. This case is constructed with fine resin infused with carbon fibers, affirming the watch's commitment to enduring toughness.
Uncompromising Strength Meets Sophisticated Design Experience the perfect blend of style, functionality, and durability with the G-Shock CasiOak Carbon Core Guard GA2100-1A1. As an illustrious heir of the original DW-5000C introduced in 1983, this watch evokes G-SHOCKās timeless appeal while pushing the boundaries of resilience. Signature Octagonal Form This model sports the unique octagonal shape reminiscent of the pioneering DW-5000C. The classic analog-digital timekeeping is seamlessly integrated into a straightforward, clutter-free design, without compromising the iconic G-SHOCK toughness. Thin Yet Robust With the high-strength resin material reinforced with carbon fibers, this watch boasts an impressively thin case. At just 11.8 mm, it stands as the thinnest among G-SHOCK combination models, offering a sleek profile without sacrificing robustness. Featuring the exclusive Neobrite technology, the GA-2100-1A and GA-2100-4A models deliver enhanced visibility in low-light conditions. Carbon Core Guard Structure The innovative carbon core guard structure provides advanced protection to the module. By enclosing it in a carbon case, the watch gains exceptional strength, crack resistance, and durability. This case is constructed with fine resin infused with carbon fibers, affirming the watch's commitment to enduring toughness.
Uncompromising Strength Meets Sophisticated Design Experience the perfect blend of style, functionality, and durability with the G-Shock CasiOak Carbon Core Guard GA2100-1A1. As an illustrious heir of the original DW-5000C introduced in 1983, this watch evokes G-SHOCKās timeless appeal while pushing the boundaries of resilience. Signature Octagonal Form This model sports the unique octagonal shape reminiscent of the pioneering DW-5000C. The classic analog-digital timekeeping is seamlessly integrated into a straightforward, clutter-free design, without compromising the iconic G-SHOCK toughness. Thin Yet Robust With the high-strength resin material reinforced with carbon fibers, this watch boasts an impressively thin case. At just 11.8 mm, it stands as the thinnest among G-SHOCK combination models, offering a sleek profile without sacrificing robustness. Featuring the exclusive Neobrite technology, the GA-2100-1A and GA-2100-4A models deliver enhanced visibility in low-light conditions. Carbon Core Guard Structure The innovative carbon core guard structure provides advanced protection to the module. By enclosing it in a carbon case, the watch gains exceptional strength, crack resistance, and durability. This case is constructed with fine resin infused with carbon fibers, affirming the watch's commitment to enduring toughness.
in 32 offers
The lowest price for G-Shock Bluetooth Casioak Watch GA-B2100-1A1 right now is $192.00 at Chrono24.com.au, compared across 12 retailers.
The all-time low was $122.10 on 30 Jan 2026 ā today's price is 57% above the lowest ever. It has been notably cheaper before ā worth setting a price alert.
Prices last updated 22 June 2026.
Last updated at 22/06/2026 03:28:44
Casio G-Shock GA-B2100-1A1JF Plastic Black 48.5mm
Delivery $44
Casio GA-B2100-1A1JF
Delivery $453
Casio GA-B2100LUU-8AJF
Delivery $453
Casio G-Shock GA-B2100BBR-1AJF Plastic Black 48.5x45.4mm 2025
Delivery $44
Casio G-Shock GA-B2100BBR-1AJF Plastic Black 48.5x45.4mm
Delivery $36
Casio G-Shock GA-B2100-1AER Carbon Black 45mm
Delivery $67
Casio G-Shock GA-B2100-1A1ER Carbon Black 45mm
Delivery $67
Casio G-Shock GA-B2100-1AER Plastic Black 45.5mm
Delivery $82
g-shock GA-B2100-1A1DR Plastic 45.4mm 2026
Delivery $47
g-shock GA-B2100LUU-8ADR Carbon 45.4mm 2026
Delivery $47
originally posted on g-shock.co.uk
It's a clever little analogue/digital watch with good looks. The sunburst dial comes to life in the sun - which surprised me! Brilliant yellow resin is refreshing but the material is not as supple as the usual Casio black resin bands - I guess it's the nature of the coloured material that is used. A little larger on the wrist than say, the 5600/5000 resin or 'full-metal squares', but its lightness makes up for this.Usual casio functionality, which is just great fun especially when watching the hands spin. Lots to learn - features, functions, connectivity! The watch automatically changed to BST at the weekend - a result of the automatic time adjustment (I'm guessing), and the watch being in close proximity to my mobile. However, I'd still prefer Multiband ...Ā MoreIt's a clever little analogue/digital watch with good looks. The sunburst dial comes to life in the sun - which surprised me! Brilliant yellow resin is refreshing but the material is not as supple as the usual Casio black resin bands - I guess it's the nature of the coloured material that is used. A little larger on the wrist than say, the 5600/5000 resin or 'full-metal squares', but its lightness makes up for this.Usual casio functionality, which is just great fun especially when watching the hands spin. Lots to learn - features, functions, connectivity! The watch automatically changed to BST at the weekend - a result of the automatic time adjustment (I'm guessing), and the watch being in close proximity to my mobile. However, I'd still prefer Multiband functionality cos I'm an older codger and unsure of all this 'connected living'!It's staying in my collection of Tough Solar, Multiband resin and full-metal Casios despite this bluetooth time adjustmant thingummyjig! I may just add the metal version - if it's not too large on the wrist.
originally posted on g-shock.co.uk
The yellow colour wasnt my first choice for a watch but I soon realised that this one had the perfect easy to read dials, the other four variants in this range were really hard to read so I decied to give this a go.Arrived the next following day after placing my order with G-Shock, I tried it on and wow it fits perfectly on the wrist. Its nice and light for everyday wear and tear having 200m water resistance. This has tough solar power and you dont have to rely on changing the batteries on this watch. Also you can connect this with your phone and adjust the settings of the watch, also this can be used to find your phone! The design is classic and this is one of G shocks god tier watches that everyone should own. I would love it if they could keep the design but ...Ā MoreThe yellow colour wasnt my first choice for a watch but I soon realised that this one had the perfect easy to read dials, the other four variants in this range were really hard to read so I decied to give this a go.Arrived the next following day after placing my order with G-Shock, I tried it on and wow it fits perfectly on the wrist. Its nice and light for everyday wear and tear having 200m water resistance. This has tough solar power and you dont have to rely on changing the batteries on this watch. Also you can connect this with your phone and adjust the settings of the watch, also this can be used to find your phone! The design is classic and this is one of G shocks god tier watches that everyone should own. I would love it if they could keep the design but make the watch smaller for people with skinny wrists.Overall this Banana watch is awesome!
originally posted on g-shock.co.uk
I had my eye on this popular version of the āCasioakā for some time but it was always out of stock. Good fortune prevails and I was able to acquire this piece, I already have GA-2100-1ER but wanted the flash of colour, solar and Bluetooth.This is a great little G-Shock, the hands and dial are easy to read and unlike the 1ER so is the LCD. The bright colour and flashes of red and blue make the overall appearance distinctive. I love the convenience of solar power, not having to bother about batteries and the Bluetooth is a hand feature but I donāt understand why I need to have 2 G-Shock/Casio apps one for my GMW-B5000 and one for this watch?Overall this a lovely addition to my watch collection and is a go to watch if Iām out on my motorbike, overall Iām very happy ...Ā MoreI had my eye on this popular version of the āCasioakā for some time but it was always out of stock. Good fortune prevails and I was able to acquire this piece, I already have GA-2100-1ER but wanted the flash of colour, solar and Bluetooth.This is a great little G-Shock, the hands and dial are easy to read and unlike the 1ER so is the LCD. The bright colour and flashes of red and blue make the overall appearance distinctive. I love the convenience of solar power, not having to bother about batteries and the Bluetooth is a hand feature but I donāt understand why I need to have 2 G-Shock/Casio apps one for my GMW-B5000 and one for this watch?Overall this a lovely addition to my watch collection and is a go to watch if Iām out on my motorbike, overall Iām very happy with this excellent watch.
| Case Material / Color | Fine Resin x Carbon Fiber, Black |
| Bezel Material / Color | Resin, Black |
| Face Color | Black |
| Module No | 5689 |
| Band Width | 18mm |
Casio G-Shock GA-B2100-1A1JF Plastic Black 48.5mm
Delivery $44
Casio GA-B2100-1A1JF
Delivery $453
Casio GA-B2100LUU-8AJF
Delivery $453
Casio G-Shock GA-B2100BBR-1AJF Plastic Black 48.5x45.4mm 2025
Delivery $44
Casio G-Shock GA-B2100BBR-1AJF Plastic Black 48.5x45.4mm
Delivery $36
It's a clever little analogue/digital watch with good looks. The sunburst dial comes to life in the sun - which surprised me! Brilliant yellow resin is refreshing but the material is not as supple as the usual Casio black resin bands - I guess it's the nature of the coloured material that is used. A little larger on the wrist than say, the 5600/5000 resin or 'full-metal squares', but its lightness makes up for this.Usual casio functionality, which is just great fun especially when watching the hands spin. Lots to learn - features, functions, connectivity! The watch automatically changed to BST at the weekend - a result of the automatic time adjustment (I'm guessing), and the watch being in close proximity to my mobile. However, I'd still prefer Multiband ...Ā MoreIt's a clever little analogue/digital watch with good looks. The sunburst dial comes to life in the sun - which surprised me! Brilliant yellow resin is refreshing but the material is not as supple as the usual Casio black resin bands - I guess it's the nature of the coloured material that is used. A little larger on the wrist than say, the 5600/5000 resin or 'full-metal squares', but its lightness makes up for this.Usual casio functionality, which is just great fun especially when watching the hands spin. Lots to learn - features, functions, connectivity! The watch automatically changed to BST at the weekend - a result of the automatic time adjustment (I'm guessing), and the watch being in close proximity to my mobile. However, I'd still prefer Multiband functionality cos I'm an older codger and unsure of all this 'connected living'!It's staying in my collection of Tough Solar, Multiband resin and full-metal Casios despite this bluetooth time adjustmant thingummyjig! I may just add the metal version - if it's not too large on the wrist.
The yellow colour wasnt my first choice for a watch but I soon realised that this one had the perfect easy to read dials, the other four variants in this range were really hard to read so I decied to give this a go.Arrived the next following day after placing my order with G-Shock, I tried it on and wow it fits perfectly on the wrist. Its nice and light for everyday wear and tear having 200m water resistance. This has tough solar power and you dont have to rely on changing the batteries on this watch. Also you can connect this with your phone and adjust the settings of the watch, also this can be used to find your phone! The design is classic and this is one of G shocks god tier watches that everyone should own. I would love it if they could keep the design but ...Ā MoreThe yellow colour wasnt my first choice for a watch but I soon realised that this one had the perfect easy to read dials, the other four variants in this range were really hard to read so I decied to give this a go.Arrived the next following day after placing my order with G-Shock, I tried it on and wow it fits perfectly on the wrist. Its nice and light for everyday wear and tear having 200m water resistance. This has tough solar power and you dont have to rely on changing the batteries on this watch. Also you can connect this with your phone and adjust the settings of the watch, also this can be used to find your phone! The design is classic and this is one of G shocks god tier watches that everyone should own. I would love it if they could keep the design but make the watch smaller for people with skinny wrists.Overall this Banana watch is awesome!
I had my eye on this popular version of the āCasioakā for some time but it was always out of stock. Good fortune prevails and I was able to acquire this piece, I already have GA-2100-1ER but wanted the flash of colour, solar and Bluetooth.This is a great little G-Shock, the hands and dial are easy to read and unlike the 1ER so is the LCD. The bright colour and flashes of red and blue make the overall appearance distinctive. I love the convenience of solar power, not having to bother about batteries and the Bluetooth is a hand feature but I donāt understand why I need to have 2 G-Shock/Casio apps one for my GMW-B5000 and one for this watch?Overall this a lovely addition to my watch collection and is a go to watch if Iām out on my motorbike, overall Iām very happy ...Ā MoreI had my eye on this popular version of the āCasioakā for some time but it was always out of stock. Good fortune prevails and I was able to acquire this piece, I already have GA-2100-1ER but wanted the flash of colour, solar and Bluetooth.This is a great little G-Shock, the hands and dial are easy to read and unlike the 1ER so is the LCD. The bright colour and flashes of red and blue make the overall appearance distinctive. I love the convenience of solar power, not having to bother about batteries and the Bluetooth is a hand feature but I donāt understand why I need to have 2 G-Shock/Casio apps one for my GMW-B5000 and one for this watch?Overall this a lovely addition to my watch collection and is a go to watch if Iām out on my motorbike, overall Iām very happy with this excellent watch.
The GA B2100 1AER arrived before I could draw breath. When I did open the box, a lovelier watch than I'd expected, was lifted out, fitting my boney, 6" wrist in a really cool way and is extremely wearable! Setting the time - well my dream came true; slick! Selecting the city also smooth, though the buttons are firm.Cons: (The alternative quartz GMA S2100 1AER without solar, may be as practical!) A solar watch is good, but I also have a normal watch, so it won't be on all the time!The day display is digital! Not identical to the rose gold pointer set-up, (GA B2100 - my error). However, the day display is easy to read.20BR water resistance. A rugged, beautiful watch, with fearures. š
Glad I went for the positive display rather than one with the negative display, much easier to read. Bluetooth function make setting up the watch easy through the Casio Watches App. The G-Shock Connected app wasn't uprgraded to cover these newer versions. The solar function means no battery changes, and the G-Shock protection and 200M Water resistance means you can wear it whatever you're doing. One thing that could be better is the automatic synchronisation times as unless you're up before 0630 with your phone on, or still up at 0030 AM it only gets two chances a day to connect. The watch is very comfortable to wear and easy to read and the upgraded backlighting is really good at night. All in all an excellent watch for the money.
Down Side: No Date displayedDesign: broughtblack body & Face.Wanted white hands so could see them easier as I am getting on abit lolFeatures: I have another casio which is is solar so wanted that again. Best feature and the main reason I brought this watch was the ability to adjust time via your phone and blue tooth connectivity. My other watch when I go abroab 3-4 times per year I had to youtube a video as couldn't remeber which buttons to push. Eye sight is deteriating which made the manual adjustment even harder - the bluetooth function makes this a piece of cake and instructions on APP too.Back ligth very handy tooI brough this watch as it was so reasonably priced and I am going on an adventure tour on my motorcycle - its stylish, light, reasonable thin, ...Ā MoreDown Side: No Date displayedDesign: broughtblack body & Face.Wanted white hands so could see them easier as I am getting on abit lolFeatures: I have another casio which is is solar so wanted that again. Best feature and the main reason I brought this watch was the ability to adjust time via your phone and blue tooth connectivity. My other watch when I go abroab 3-4 times per year I had to youtube a video as couldn't remeber which buttons to push. Eye sight is deteriating which made the manual adjustment even harder - the bluetooth function makes this a piece of cake and instructions on APP too.Back ligth very handy tooI brough this watch as it was so reasonably priced and I am going on an adventure tour on my motorcycle - its stylish, light, reasonable thin, waterproof and bomb proof, if its stolen it wont be end of world.Casio heres a challenge: same styule watch: similar functions plus Date (as number), with digial time and date larger so middle age people don't have to squint.I would sacrific the permanent battery level hand/indicator for this and second countingBut all round a very nice watch, my go too for when I am on my motorbike, SUP, Kayak, on holiday or in the garden.
I bought this as a summer daily wearer, the yellow seeming perfect for the warmer months. In particular, I wanted something that could take the knocks of daily wear, and the g-shock has not disappointed. It takes a little while to get to grips with the Bluetooth setting up, but once that is sorted the whole package makes brilliant sense. I had more comments about it in the first fortnight than I did about my entire watch collection put together ever. Only thing Iād change is the battery and function indicator sub dial: the colours makes it difficult to read in all but the brightest of environs. However, I would definitely recommend!
A lovely, very comfortable and light watch. Both rugged and smart. I wear it to work, in the office and swimming. Loving the solar power battery, so no risk of affecting its water resistance.I have a small wrist, just over 6" and it fits very well. I am in fact getting more into slightly larger watches, but only Casios, as they feel so light and offer many functions. Extremely versatile.Casios are amazing watches. Addictive too! Love the Casio neon/virtual blue GA-2100 but it's not solar powered so a deal breaker sadly. The Japanese market offers more choice generally.This little black number, with red and blue accents is lovely though and gets lots of wrist time! I recommend it but be prepared to start a collection. Check out the neon green and blue ones too. ...Ā MoreA lovely, very comfortable and light watch. Both rugged and smart. I wear it to work, in the office and swimming. Loving the solar power battery, so no risk of affecting its water resistance.I have a small wrist, just over 6" and it fits very well. I am in fact getting more into slightly larger watches, but only Casios, as they feel so light and offer many functions. Extremely versatile.Casios are amazing watches. Addictive too! Love the Casio neon/virtual blue GA-2100 but it's not solar powered so a deal breaker sadly. The Japanese market offers more choice generally.This little black number, with red and blue accents is lovely though and gets lots of wrist time! I recommend it but be prepared to start a collection. Check out the neon green and blue ones too. They are sober yet funky, as is my GA-B2100-1AER.
Have been waiting for a solar powered Casio 'Oak' for a long time (as I don't like having to have batteries changed) so when I saw this online I has to order as it's still not available in stores. Excellent service from the Casio shop and delivered within 2 days of my order being placed. My fears that it may wear too big for my 6.25'' wrist were unfounded (wears the same as my GW-M5610, same strap as well I think?) and it's as light, comfortable and tough as you'd expect. Set up I found very difficult at first due to the lack of printed instructions so I had to find a Youtube video about it. Once this was done and I'd installed the app and registered it all was well and it's now easy to control via the phone app. The digital screens are tiny and very hard to read ...Ā MoreHave been waiting for a solar powered Casio 'Oak' for a long time (as I don't like having to have batteries changed) so when I saw this online I has to order as it's still not available in stores. Excellent service from the Casio shop and delivered within 2 days of my order being placed. My fears that it may wear too big for my 6.25'' wrist were unfounded (wears the same as my GW-M5610, same strap as well I think?) and it's as light, comfortable and tough as you'd expect. Set up I found very difficult at first due to the lack of printed instructions so I had to find a Youtube video about it. Once this was done and I'd installed the app and registered it all was well and it's now easy to control via the phone app. The digital screens are tiny and very hard to read for my middle aged man's eyes (but I knew this when I ordered) but that's the only (slight) negative - everything else about it is superb, as was getting it for just Ā£116 with the introductory voucher!
I've waited one month before writing this review to give my B2100 a fair chance. It's been worn everyday from dawn to dusk for work and play (very dusty workshop and sea water for play !!!).I can only report that this is an extraordinary watch. Very light and comfortable to wear, clear face readings with great personalisation abilities. I have had no irritation from the strap. I've an 8inch wrist and this watch sits on very neatly and because of its slim line it presents no problem when you want to wear less casual cloathing.Reliability; its only been 1 month but time keeping appears excellent. I've deliberately not made allowances for the tough solar charging but charge has remained high with only very slight levels of movement.It would be appropriate to mention ...Ā MoreI've waited one month before writing this review to give my B2100 a fair chance. It's been worn everyday from dawn to dusk for work and play (very dusty workshop and sea water for play !!!).I can only report that this is an extraordinary watch. Very light and comfortable to wear, clear face readings with great personalisation abilities. I have had no irritation from the strap. I've an 8inch wrist and this watch sits on very neatly and because of its slim line it presents no problem when you want to wear less casual cloathing.Reliability; its only been 1 month but time keeping appears excellent. I've deliberately not made allowances for the tough solar charging but charge has remained high with only very slight levels of movement.It would be appropriate to mention the service delivery, packaging and so on which you buy into when you buy a G-Shock : I have found all aspects have been up to the standards this watch brand sets.My only complaint is why, why didn't I buy one earlier.....
| Case Material / Color | Fine Resin x Carbon Fiber, Black |
| Bezel Material / Color | Resin, Black |
| Face Color | Black |
| Module No | 5689 |
| Band Width | 18mm |
