Is the GA2100-1A1 good for swimming?

Yes. It is rated to 200 m (20 bar) water resistance, so swimming and snorkeling are fine. Casio does not rate it for scuba diving.

Does it have Bluetooth or solar charging?

No. This model runs on a standard battery and has no Bluetooth or app pairing. Those features appear on other G-Shock lines.

How does it compare with the GA2100-1A?

They share the same case, module and octagonal design. The difference is the colorway, so pick the look you prefer; performance is the same.

How big is it on the wrist?

The case measures 48.5 × 45.4 × 11.8 mm and weighs 51 g. That is slim and light for a G-Shock, and it wears smaller than the brand's chunky models.

Can I read it in the dark?

Yes. Two Super Illuminator LEDs light the analog hands and the digital display, so you can read both at night.

The watch with its resin band, a manual and the standard Casio packaging. No charging cable is needed since it uses a battery.

Casio G-Shock CARBON CORE Mens Ana-Digi All Black Watch GA2100-1A1

Q: Where is the Casio G-Shock CARBON CORE Mens Ana-Digi All Black Watch GA2100-1A1 cheapest?

At Paramount-jewelers-LLC, for $83.00, 25% under what the other stores charge, as of our latest check.

Q: What do buyers say about the Casio G-Shock CARBON CORE Mens Ana-Digi All Black Watch GA2100-1A1?

Rated 4.9 out of 5 from 43 ratings.

Q: Where can I buy the Casio G-Shock CARBON CORE Mens Ana-Digi All Black Watch GA2100-1A1?

16 stores we checked sell it, including Paramount-jewelers-LLC, Amazon, Walmart, Buckle, Zumiez.

Best price now

$83.00at Paramount-jewelers-LLCChecked 52 min ago

25% under what the other stores charge

Compared across 15 stores. Prices are checked against each store and labelled with when.

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What reviewers say

4.9 / 543 ratings

Owners rate it very highly, praising the slim, light case and the tough G-Shock build in an understated black design. The main complaints are the lack of connected features and legibility of the dark dial.

What people mention

Size and weightPraisedOwners say the slim case and light weight make it comfortable for all-day wear.
BuildPraisedReviewers describe it as tough and well made, in line with G-Shock expectations.
LegibilityMixedSome find the all-black dial and markers hard to read unless the LEDs are on.
FeaturesCriticisedBuyers note it lacks Bluetooth, app pairing and solar charging found on other G-Shocks.
LightingPraisedThe dual Super Illuminator LEDs are called effective for reading at night.

About the Casio G-Shock CARBON CORE Mens Ana-Digi All Black Watch GA2100-1A1

The G-SHOCK GA2100-1A1 is an analog-digital watch in all black. It has an octagonal bezel and raised hour markers. The case and bezel are carbon and resin, and the band is resin.

It uses a Carbon Core Guard structure for shock resistance in a slim case that is 11.8 mm thick. Water resistance is 200 meters (20 bar). The face is covered with mineral glass.

Two LED lights help with reading in the dark: a Super Illuminator for the analog face and one for the digital display. Both have a selectable duration of 1.5 or 3 seconds and an afterglow. The hands can shift out of the way to give a clear view of the digital display.

Case size

48.5 × 45.4 × 11.8 mm (L × W × H)

Weight

51 g

Case/bezel

Carbon / resin

Band

Resin

Glass

Mineral glass

Shock resistance

Carbon Core Guard structure

Water resistance

200 m (20 bar)

Battery

SR726W × 2, approx. 3 years

Accuracy

±15 seconds per month

Timekeeping

Analog: hour and minute hands (minute hand moves every 20 seconds), day dial. Digital: hour, minute, second, PM, month, date

Time format

12/24-hour

World time

31 time zones (48 cities + UTC), daylight saving on/off

Stopwatch

1/100-second; measures 00'00''00 to 59'59''99 for the first 60 minutes, then 1:00'00 to 23:59'59 (1-second unit); elapsed, split and 1st-2nd place times