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Deal.ai › Casio
Casio
Casio G-Shock GA-B2100D Series Bluetooth Solar Analog-Digital Watch

Casio G-Shock GA-B2100D Series Bluetooth Solar Analog-Digital Watch

Best price now

$134.99at AmazonChecked Nov 9

Compared across 10 stores. Prices are checked against each store and labelled with when. As an Amazon Associate, Deal.ai earns from qualifying purchases.

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Price facts

  • Last seen at $134.99 at Amazon on Nov 9.
  • Checked at 10 stores.

Our take on the Casio G-Shock GA-B2100D Series Bluetooth Solar Analog-Digital Watch

The GA-B2100D is Casio's octagonal CasiOak case with two upgrades the original GA-2100 lacked: Bluetooth phone link and Tough Solar charging. It keeps the slim carbon core guard build, 20-bar water resistance and shock resistance, and adds automatic time correction, roughly 300-city world time and a phone finder through the G-Shock app. The analog-digital display with hands that move aside for the LCD stays readable, and the double LED light covers both the dial and the screen. It suits people who want a tough everyday watch with accurate time and no battery swaps, and it undercuts steel-case G-Shocks on features per dollar while staying lighter on the wrist.

Best forEveryday wear with water and impact exposureTravelers crossing time zonesBuyers who want solar charging and no battery changesFans of the octagonal CasiOak look
Pros
  • Tough Solar charging means no routine battery swaps
  • Bluetooth link corrects time automatically and sets world time from the phone
  • Shock-resistant carbon core guard case with 20-bar water resistance
  • Slim octagonal case wears smaller than most G-Shocks
  • Double LED light with afterglow for the dial and LCD
  • Hands shift aside when they overlap the digital display
Cons
  • Solar cell under the dial limits some color and finish options
  • Bluetooth features need the G-Shock app and a paired phone
  • Analog hands and small LCD take a moment to read at a glance
  • No GPS; time sync depends on the phone connection

Casio G-Shock GA-B2100D Series Bluetooth Solar Analog-Digital Watch prices at every store

  • eBayPre-owned

    In stockShips from Ireland · duties may apply · made for another market

    $110.12+ $10.05 shippingChecked Nov 9
    Visit eBay
  • eBayPre-owned

    In stockSold by japans.watch.shopMade for another market

    $137.20+ $24.00 shippingChecked Nov 9
    Visit eBay
  • BanzaiHobbyNew

    In stockShips from abroad · duties may apply · made for another market

    $142.63+ $24.69 shippingChecked Nov 9
    Visit BanzaiHobby
  • DokodemoNew

    In stockShips from abroad · duties may apply · made for another market

    $146.16+ $24.89 shippingChecked Nov 9
    Visit Dokodemo
  • wafuu.comNew

    In stockShips from abroad · duties may apply · made for another market

    $160.00+ $11.99 shippingChecked Nov 9
    Visit wafuu.com
  • japan-selectNew

    In stockShips from abroad · duties may apply · made for another market

    $155.00+ $25.00 shippingChecked Nov 9
    Visit japan-select
  • Discovery JapanNew

    In stockShips from abroad · duties may apply · made for another market

    $155.41+ $24.69 shippingChecked Nov 9
    Visit Discovery Japan
  • Rook JapanNew

    In stockShips from abroad · duties may apply · made for another market

    $188.00Free shippingChecked Nov 9
    Visit Rook Japan
  • animotaNew

    In stockShips from abroad · duties may apply · made for another market

    $215.22+ $33.10 shippingChecked Nov 9
    Visit animota
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $134.99Free shippingChecked Nov 9
    Visit Amazon

Store links may earn us a commission.

Casio G-Shock GA-B2100D Series Bluetooth Solar Analog-Digital Watch price history

$134.99$134.99
Nov 8Nov 10

Lowest price we've seen: $134.99 on Nov 8 at Amazon. Tracked across 8 stores since Nov 8.

What reviewers say

Owners of the GA-B2100 line praise the slim octagonal case, the solar charging and the accurate time from phone sync. Complaints center on the small digital display and the reliance on the app for the smart features.

What people mention
  • Size and fitPraisedOwners say the octagonal case is noticeably slimmer and lighter than typical G-Shocks.
  • Solar chargingPraisedReviewers report the solar cell keeps the battery topped up with ordinary indoor and outdoor light.
  • Time accuracyPraisedPhone link time correction is called out as keeping the watch spot on across time zones.
  • Display legibilityCriticisedThe small digital window and overlapping hands make quick reading harder than on full-digital models.
  • App pairingMixedSome owners find the G-Shock app setup and reconnection fussy, while others have no trouble.

From BanzaiHobby

  • Shock-resistant construction protects the module from impact
  • 20-bar water resistance for swimming, surfing and water work
  • Bluetooth mobile link with a compatible phone
  • Tough Solar charging system runs on light
  • Octagonal GA-2100 case shape with a thin module
  • Double LED light with afterglow
Materials
Carbon Core Guard structure; case and band colors include blue, green and yellow
Fit
Keeps the size feel of previous models despite the added functions
Guarantee
Guaranteed authenticity: all products 100% original
Shipping
Ships directly from Japan; shipping cost shown in cart; EMS, ePacket, Sea or FedEx; handling 48 hrs, ship 72 hrs; some items add 3–14 business days; US duties a
In the box
Watch body, Box, Instruction manual, Warranty card (attached to the manual)

About the Casio G-Shock GA-B2100D Series Bluetooth Solar Analog-Digital Watch

The G-Shock GA-B2100 is an analog-digital watch with an octagonal case that carries over the shape of the GA-2100. It adds smartphone link and Tough Solar charging. The shock-resistant construction protects the module, and the uneven case shape keeps direct impacts off the glass and buttons.

A newly developed thin module with an optimized board layout works with the Carbon Core Guard structure, so the watch keeps the size of earlier models. It is water resistant to 20 bar, which covers daily water use, swimming, surfing and jet skiing. The solar panel and a large-capacity secondary battery power the watch from even small amounts of light.

With the G-SHOCK WATCHES app, the watch connects over Bluetooth to a compatible iPhone or Android phone. The app enables automatic time adjustment, easy watch setup, a phone finder, a time and place reminder, and world time for about 300 cities. The watch itself shows world time for 38 cities plus UTC. It also has a stopwatch, a timer, five alarms, a full auto calendar, and a double LED light. A hand-retract function moves the hands aside when they cover the LCD display.

Model
GA-B2100-1AJF
Color
Black
Water resistance
20 bar
Power
Tough Solar charging with a rechargeable secondary battery
Connectivity
Bluetooth mobile link; requires the G-SHOCK WATCHES app on a compatible iPhone or Android phone
World time
38 cities (38 time zones, automatic daylight saving) plus UTC
Stopwatch
1/100 second (under 1 hour), 1 second (1 hour or more); 24-hour measuring, lap/split
Timer
Set in 1-second units, up to 60 minutes
Lighting
Double LED light with afterglow, selectable 1.5 or 3 seconds

What buyers say

Buyers like
  • Fast dispatch and quick delivery
  • Careful, well-padded packaging
  • Items arrive in excellent condition
  • Good prices and discount coupons
  • Large selection of model kits
  • Reliable, trustworthy seller

Questions and answers

Is the GA-B2100D worth it over the original GA-2100?
Yes if you want solar charging and automatic time correction. The GA-2100 is cheaper and simpler but needs battery changes and manual time setting.
Does it need a phone to keep time?
No. It runs as a normal watch and the solar cell keeps it charged. Bluetooth only adds automatic time sync, world time setup and the phone finder.
How does it compare with a steel-case G-Shock?
It is lighter and slimmer thanks to the carbon core guard case, and it offers the same 20-bar water resistance and shock resistance. Steel models feel heavier and more premium but cost more.
Is it good for swimming and surfing?
Yes. It is rated to 20 bar, which covers swimming, surfing and other water sports.
What is in the box?
The watch, the box, an instruction manual and a warranty card attached to the manual.
How long does the battery last?
With regular light exposure the solar cell keeps it running indefinitely. In darkness, power saving blanks the display, and the battery indicator warns before charge runs low.
Where is the Casio G-Shock GA-B2100D Series Bluetooth Solar Analog-Digital Watch cheapest?
At Amazon, for $134.99, as of our latest check.
What do buyers say about the Casio G-Shock GA-B2100D Series Bluetooth Solar Analog-Digital Watch?
Buyers like: Fast dispatch and quick delivery; Careful, well-padded packaging; Items arrive in excellent condition.
Where can I buy the Casio G-Shock GA-B2100D Series Bluetooth Solar Analog-Digital Watch?
9 stores we checked sell it, including wafuu.com, eBay, BanzaiHobby, Dokodemo, japan-select.

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Stores we've priced the Casio G-Shock GA-B2100D Series Bluetooth Solar Analog-Digital Watch at

  • Rook Japan deals and prices
  • wafuu.com deals and prices

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