How is this different from the resin GA-2100?

Same octagonal shape and analog-digital layout, but this one has a stainless steel case, bezel and band plus Tough Solar and Bluetooth. The resin version is lighter and cheaper but runs on a battery.

Does it need a battery change?

No routine battery change in normal use. Tough Solar charges from light through the dial, and the cell is only replaced if it fails.

What does the Bluetooth app do?

It syncs the watch to your phone's time and handles settings. Some owners report the connection does not work, so treat it as a bonus rather than a must-have.

Is it good for swimming?

Yes. It is rated to 200 m water resistance, which covers swimming and showering. Avoid pressing buttons underwater.

What comes in the box?

The watch, box and papers. No charging cable is needed since it charges from light.

Is the metal bracelet hard to size?

It uses standard pin links, so a jeweler or a small tool can remove links. Some owners find the fit fiddly out of the box.

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This hour's deals

−40%

Clothes · Silver Factory

Casio G-Shock Men's Watch

Name: Casio G-Shock Men's Watch
Brand: Casio
Availability: InStock

Deal score 4.5 · Good deal

$150.00$250.00 Silver Factory's regular price

You save $100.00 at Silver Factory

Deal.ai's agents found this deal on November 9. The store may have changed its price since.

Why it's a great deal

Silver Factory lists its regular price at $250.00: 40% off by its own figures
Rated 5.0 out of 5 by 129 buyers

Visit Silver Factory

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From Banned Skate Shop

Full-metal addition to the 2100 line of G-SHOCK timepieces
Screw-back case, bezel and band crafted in stainless steel
Octagonal bezel and dimpled band design inspired by the 1983 original
Analog-digital combination module in a slim, compact profile
Tough Solar and high-brightness LED light
Pairs with a smartphone via Bluetooth app for precision timekeeping

Materials: Stainless steel case, bezel and band
Fit: Comfortable fit
Shipping: Free shipping over Continent US; promo code "Freeship2"
In the box: Box, Papers

What buyers say

Buyers complain about

Bluetooth is not functional

About the Casio G-Shock Men's Watch

The GM-B2100 is the full-metal version of Casio's octagonal 2100 line, a slim analog-digital G-Shock with a stainless steel screw-back case, bezel and band. It adds Tough Solar charging and Bluetooth phone pairing to the standard resin 2100, so it keeps accurate time and never needs a battery swap in normal use. The steel build makes it dressier and heavier than the resin GA-2100, but it costs more and some owners report the Bluetooth link failing. It suits people who want a rugged watch that reads well with a shirt.

Best forFans of the octagonal 2100 look who want metalEveryday wear that goes from work to weekendBuyers who want solar charging and no battery changesGift for someone who likes tough analog-digital watches

Pros

Full stainless steel case, bezel and band with screw-back construction
Tough Solar charging removes routine battery changes
Bluetooth pairing with the Casio app for automatic time correction
Slim, compact analog-digital module for a metal G-Shock
High-brightness LED light and 200 m water resistance

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