• G-shock Ga-2100-1a1er One Sieze
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G-shock Ga-2100-1a1er One Sieze

4.4 out of 5 stars 2,839 ratings
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About this item

  • Glass : Mineral Glass
  • Case Material : Carbon / Resin
  • Case Color : Black
  • Strap Material : Resin
  • Movement : Quartz
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Casio Unisex's Quartz Watch GA-2100-1A1ER
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Product description

For those who want to know exactly, the countdown timer helps remind special or recurring events by emitting an acoustic signal at the set time. It then automatically counts back from the preset time. The time can be set in minutes and up to 24 hours in advance. This function is particularly practical for daily use of medications or interval training. The daily alarm reminds you of daily recurring events, where an acoustic signal sounds at the set time. This model has five independent alarms - especially practical for daily use of medicines or for keeping regular appointments.

Product specifications

Watch Information
Brand, Seller, or Collection Name Casio
Model Number GA-2100-1A1DR
Part Number GA-2100-1A1ER
Item Shape Round
Dial window material type Mineral Glass
Display Type Analog-Digital
Clasp Type Hook Buckle
Case material Resin
Case diameter 42 millimeters
Case Thickness 11.8 millimeters
Band Material Resin
Band width 22 millimeters
Band Colour Black
Dial colour Black
Special features Alarm, Stopwatch, World Time, Light
Item weight 30 grams
Movement Quartz
Water resistant depth 200 meters
Warranty type manufacturer-and-seller-combination
Warranty If this product is sold by 鶹, please review the manufacturer’s website for warranty information. If this product is sold by another party, please contact the seller directly for warranty information for this product. You may also be able to find warranty information on the manufacturer’s website.

Product details

  • Batteries ‏ : ‎ 1 Lithium Metal batteries required.
  • Is discontinued by manufacturer ‏ : ‎ No
  • Language ‏ : ‎ English
  • Product Dimensions ‏ : ‎ 10 x 10 x 5 cm; 30 g
  • Date First Available ‏ : ‎ Oct. 27 2020
  • Manufacturer ‏ : ‎ Casio
  • ASIN ‏ : ‎ B07WGJ1JNW
  • Item model number ‏ : ‎ GA-2100-1A1DR
  • Department ‏ : ‎ unisex-adult
  • 鶹 Rank: #24,695 in Clothing, Shoes & Accessories (See Top 100 in Clothing, Shoes & Accessories)
  • Customer Reviews:
    4.4 out of 5 stars 2,839 ratings

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Top Brand: Casio

Highly Rated
100K+ customers rate items from this brand highly
Trending
50K+ orders for this brand in past 3 months
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Customer reviews

4.4 out of 5 stars
2,839 global ratings

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Customers say

Customers like the design, durability, and performance of the watch. They mention it's a beautiful watch with a tactical style. They also say it's not bulky like other models and performs well.

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DesignDurabilityPerformanceSlim design
17 customers mention "Design"17 positive0 negative

Customers like the design of the watch. They mention it has a tactical style, is a classic watch, and has a nice modern all-black design with inverted digital display. Some say it's a high-quality watch for around $100-120 CDN.

"Great watch!..." Read more

"Nice watch..." Read more

"Best watch I've ever had in my life, going strong for almost 2 years now with a bit of scratches the thing just doesn't wanna die...." Read more

"Got this last week, and so far it seems to be just as advertised and solid, only thing is it can be a bit tricky at first to set the time and all..." Read more

4 customers mention "Durability"4 positive0 negative

Customers are satisfied with the durability of the watch. They mention it's not too bulky and goes strong for almost 2 years. They also say it's a reliable watch for a decent price.

"Best watch I've ever had in my life, going strong for almost 2 years now with a bit of scratches the thing just doesn't wanna die...." Read more

"...Rugged build, and stealthy in design the Casio 2100 is affordable and works great too...." Read more

"Very good and reliable watch for a decent price" Read more

"Very cool stealth watch good quality. Not too bulky and seems durable." Read more

3 customers mention "Performance"3 positive0 negative

Customers are satisfied with the performance of the watch. They mention it looks good and performs well.

"...build, and stealthy in design the Casio 2100 is affordable and works great too...." Read more

"...This watch looks good and performs well" Read more

"Very good and reliable watch for a decent price" Read more

3 customers mention "Slim design"3 positive0 negative

Customers like the slim design of the watch. They mention it looks amazing and is not bulky like other models.

"...Nothing super big ether just nice and modern" Read more

"Looks amazing. Not bulky like other models" Read more

"Very cool stealth watch good quality. Not too bulky and seems durable." Read more

Elegant
5 out of 5 stars
Elegant
Simple elegant and a suitable daily watch
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Top reviews from Canada

  • Alex
    5.0 out of 5 stars Solid watch worth the money
    Reviewed in Canada on May 26, 2025
    Verified Purchase
    Best watch I've ever had in my life, going strong for almost 2 years now with a bit of scratches the thing just doesn't wanna die. It tells the time great.
    Helpful
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  • Jonathan
    5.0 out of 5 stars La perfect toolwatch
    Reviewed in Canada on April 19, 2025
    Verified Purchase
    Très satisfait de cette Gshock - je suis partie en vacances avec à la plage elle n’a pas quitté mon poignet. Je recommande fortement.
    Helpful
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  • Daniel
    5.0 out of 5 stars So far so good
    Reviewed in Canada on September 16, 2024
    Verified Purchase
    Got this last week, and so far it seems to be just as advertised and solid, only thing is it can be a bit tricky at first to set the time and all the other settings but once all that is figured out it seems to be a really cool and just overall bang for your buck watch. Nothing super big ether just nice and modern
    2 people found this helpful
    Helpful
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  • Richard William Kirkpatrick-Thorne
    4.0 out of 5 stars Great watch!
    Reviewed in Canada on October 25, 2024
    Verified Purchase
    My first watch in over 15 or so years, and it is worth the $120 CDN that I paid. Was shipped from Italy(?), went through Paris, then through the USA before finally arriving at my door 3 days later and the watch was worth the wait. Rugged build, and stealthy in design the Casio 2100 is affordable and works great too. I recommend it if you are looking for a high quality watch for around $100-120 CDN. Other vendors charged slightly more for it, some for $140-170 but with overnight shipping. If you have no problem with waiting a couple of days, you can own a Casio 2100 for a noticable discount.
    Helpful
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  • Vinayak Anil
    5.0 out of 5 stars Elegant
    Reviewed in Canada on July 30, 2025
    Verified Purchase
    Simple elegant and a suitable daily watch
    Customer image
    Vinayak Anil
    5.0 out of 5 stars
    Elegant

    Reviewed in Canada on July 30, 2025
    Simple elegant and a suitable daily watch
    Images in this review
    Customer image
    Helpful
     Report
  • Stephan D
    1.0 out of 5 stars Hour & Minute hands not working
    Reviewed in Canada on June 15, 2025
    Verified Purchase
    Been trying for minutes and hours, doomscrolling on the Casio manual, YouTube and Reddit trying to figure out why the hour minute hands weren’t budging even after trying literally every possible way I could find . The hands haven’t moved for more than 10 hours. Honestly I was so excited to get the watch and then this what I was landed with. Extremely disappointed
    Customer image
    Stephan D
    1.0 out of 5 stars
    Hour & Minute hands not working

    Reviewed in Canada on June 15, 2025
    Been trying for minutes and hours, doomscrolling on the Casio manual, YouTube and Reddit trying to figure out why the hour minute hands weren’t budging even after trying literally every possible way I could find . The hands haven’t moved for more than 10 hours. Honestly I was so excited to get the watch and then this what I was landed with. Extremely disappointed
    Images in this review
    Customer imageCustomer image
    Helpful
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  • 鶹 Customer
    5.0 out of 5 stars Value for money
    Reviewed in Canada on July 9, 2025
    Verified Purchase
    Always been a g shock fan, best watch ever. Fits perfectly as per the size of the wrist.100% value for money.
    Customer image
    鶹 Customer
    5.0 out of 5 stars
    Value for money

    Reviewed in Canada on July 9, 2025
    Always been a g shock fan, best watch ever. Fits perfectly as per the size of the wrist.100% value for money.
    Images in this review
    Customer image
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  • Stevie R
    5.0 out of 5 stars It's a classic.
    Reviewed in Canada on December 8, 2024
    Verified Purchase
    There's not much I can say about this classic watch from Casio that hasn't already been said other than it's a modern day icon.
    Helpful
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Top reviews from other countries

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  • Michel
    5.0 out of 5 stars Fait son effet
    Reviewed in Belgium on November 19, 2024
    Verified Purchase
    Très content de cet achat qui fait son effet !
    Report
  • Liviano Tremontini
    5.0 out of 5 stars Orologio robusto e leggero
    Reviewed in Italy on March 24, 2025
    Verified Purchase
    Orologio solido e resistente , ma allo stesso tempo leggero , oltre che per me bellissimo esteticamente , la lettura notturna è difficile dati i colori , ma il quadrante è dotato di una micro spia luminosa che si accende con pulsante , anche se con evidenti differenze legate alle funzionalità rispetto agli Smart Watch , la trovo un ottima alternativa , a prezzo ed estetica decisamente più accettabili , e soprattutto senza l angoscia della ricarica quotidiana
    Report
  • Adolfo
    5.0 out of 5 stars Relógio imbatível pelo preço
    Reviewed in Spain on June 4, 2025
    Verified Purchase
    Estou bastante satisfeito com a compra que fiz.
    O relógio esteticamente é muito bonito, faz todo o sentido ser apelidado de Casioak.
    No pulso é extremamente leve, passado uns minutos de usar nem me lembro que o tenho.
    Bracelete em resina, parece ser de um material resistente e duradouro.
    Quando o tirei da caixa, tive alguma dificuldade a configurar, isto porque foi o meu primeiro Casio, mas após recorrer às instruções facilmente consegui configurar.
    Apesar de as dimensões parecerem enormes no papel, colocado no pulso não fica de todo grande de mais, não tem nada a ver com os Gshocks enormes que existem, dá para usar perfeitamente com uma roupa mais formal, ou para usar no dia a dia de forma mais descontraída.
    De facto não tenho nada de negativo a apontar e só posso recomendar este relógio.
    Consegui uma promoção e adquiri por 77€.
    Customer image
    Adolfo
    5.0 out of 5 stars
    Relógio imbatível pelo preço

    Reviewed in Spain on June 4, 2025
    Estou bastante satisfeito com a compra que fiz.
    O relógio esteticamente é muito bonito, faz todo o sentido ser apelidado de Casioak.
    No pulso é extremamente leve, passado uns minutos de usar nem me lembro que o tenho.
    Bracelete em resina, parece ser de um material resistente e duradouro.
    Quando o tirei da caixa, tive alguma dificuldade a configurar, isto porque foi o meu primeiro Casio, mas após recorrer às instruções facilmente consegui configurar.
    Apesar de as dimensões parecerem enormes no papel, colocado no pulso não fica de todo grande de mais, não tem nada a ver com os Gshocks enormes que existem, dá para usar perfeitamente com uma roupa mais formal, ou para usar no dia a dia de forma mais descontraída.
    De facto não tenho nada de negativo a apontar e só posso recomendar este relógio.
    Consegui uma promoção e adquiri por 77€.
    Images in this review
    Customer imageCustomer imageCustomer image
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  • Jonell Abril
    5.0 out of 5 stars slimmest, smallest gshock
    Reviewed in the United Arab Emirates on June 5, 2025
    Verified Purchase
    light weight, 42mm, great quality as expected
    Report
  • Eric
    5.0 out of 5 stars Cool klokje!
    Reviewed in the Netherlands on March 28, 2025
    Verified Purchase
    Erg mooi klokje, niet te groot niet te klein. Het instellen van het klokje beetje tricky maar op youtube staan video’s hoe het moet. Het klokje is niet altijd gemakkelijk af te lezen aangezien het zwart is maar er zit een licht knop op zodat je hem kan aflezen. Ik ben er tevreden mee! Oja, vlotte levering ook!
    Report

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