Casio G-Shock GA-B2100CT-1A5

Last price we saw

$136.00at CASIO, last seen Nov 10

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Price facts

Last seen at $136.00 at CASIO on Nov 10.

Our take on the Casio G-Shock GA-B2100CT-1A5

The GA-B2100CT-1A5 is Casio's CasiOak with Tough Solar charging and Bluetooth phone pairing, wrapped in a black resin strap. It keeps the slim octagonal case that made the line popular, adds 200m water resistance, shock resistance and a dual analog-digital display. It suits people who want a rugged everyday watch with solar power and smartphone timekeeping without paying for a metal bracelet. Against the plain GA-B2100, the CT version is a strap variant; against the metal-bezel GM-B2100, it is lighter and less flashy.

Best forEveryday wear with active useBuyers who want solar power and Bluetooth in a G-ShockFans of the octagonal CasiOak lookGifts for someone who needs a tough watch

Pros

Tough Solar charging cuts battery swaps
Bluetooth syncs time and settings from a phone
Slim octagonal case wears smaller than most G-Shocks
200m water resistance and shock resistance
Analog-digital display with date and world time
Light at about 2 oz

Cons

Casio G-Shock GA-B2100CT-1A5 prices at every store

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$136.00Free shippingChecked Nov 9
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Casio G-Shock GA-B2100CT-1A5 price history

$136.00$136.00

Nov 8Nov 10

Lowest price we've seen: $136.00 on Nov 8 at CASIO. Tracked across 1 store since Nov 8.

What reviewers say

Owners like the CasiOak shape and the step up to solar and Bluetooth. Most praise the light, comfortable fit and the tough build. Complaints center on the small, dim digital window and the plastic feel of the strap and bezel.

What people mention

BuildPraisedOwners describe it as solid and shock-resistant, holding up to knocks and daily wear.
ComfortPraisedThe slim case and light weight make it easy to wear all day, even on smaller wrists.
Solar chargingPraisedBuyers like that sunlight keeps it running and they rarely think about the battery.

Questions and answers

Is the GA-B2100CT-1A5 solar powered?: Yes. Tough Solar charges from light through the dial, so you rarely need to replace the battery. Keep it in light regularly to avoid a low charge.
Does it connect to a phone?: Yes. Bluetooth pairs with the Casio Watches app for automatic time correction, world time and settings. Pairing takes a minute and can be skipped if you prefer manual setup.
How does it compare with the standard GA-B2100?: It uses the same solar and Bluetooth module and case. The CT is a strap variant with its own colorway, so pick it on looks rather than features.
Is it good for swimming?: Yes. It is rated to 200m and is fine for swimming and snorkeling. Avoid pressing the buttons underwater and skip deep diving.
What is in the box?: The watch, a resin strap already fitted, and a user guide. No charging cable is needed because it charges from light.
Is it too big for small wrists?: It is one of the slimmer G-Shocks at about 2 oz, and most owners find it fits well. Check the case dimensions against a watch you already own if you are unsure.

More men's watches

Our take on the Casio G-Shock GA-B2100CT-1A5

Best forEveryday wear with active useBuyers who want solar power and Bluetooth in a G-ShockFans of the octagonal CasiOak lookGifts for someone who needs a tough watch

Pros

Tough Solar charging cuts battery swaps
Bluetooth syncs time and settings from a phone
Slim octagonal case wears smaller than most G-Shocks
200m water resistance and shock resistance
Analog-digital display with date and world time
Light at about 2 oz

Cons

What reviewers say

What people mention

BuildPraisedOwners describe it as solid and shock-resistant, holding up to knocks and daily wear.
ComfortPraisedThe slim case and light weight make it easy to wear all day, even on smaller wrists.
Solar chargingPraisedBuyers like that sunlight keeps it running and they rarely think about the battery.

Questions and answers

Is the GA-B2100CT-1A5 solar powered?

Yes. Tough Solar charges from light through the dial, so you rarely need to replace the battery. Keep it in light regularly to avoid a low charge.

Does it connect to a phone?

Yes. Bluetooth pairs with the Casio Watches app for automatic time correction, world time and settings. Pairing takes a minute and can be skipped if you prefer manual setup.

How does it compare with the standard GA-B2100?

It uses the same solar and Bluetooth module and case. The CT is a strap variant with its own colorway, so pick it on looks rather than features.

Is it good for swimming?

Yes. It is rated to 200m and is fine for swimming and snorkeling. Avoid pressing the buttons underwater and skip deep diving.

What is in the box?

The watch, a resin strap already fitted, and a user guide. No charging cable is needed because it charges from light.

Is it too big for small wrists?

It is one of the slimmer G-Shocks at about 2 oz, and most owners find it fits well. Check the case dimensions against a watch you already own if you are unsure.