Is the GA-B2100-2A worth it over the standard GA-2100?

Yes if you want solar charging and Bluetooth time sync. The basic GA-2100 is cheaper but runs on a coin cell and needs manual time setting.

Does it need charging or a battery change?

It runs on Tough Solar, so normal light keeps it charged. Casio rates about seven months on a full charge without further light, and the cell is not meant to be user-replaced often.

Yes. It is rated to 20 ATM (200 m), which covers swimming, snorkeling and water sports. It is not a dive computer.

How does it compare with the GBD-200?

The GBD-200 has a larger MIP display and step tracking but a bulkier case. The GA-B2100 is slimmer, analog-digital and lighter on the wrist.

Does the Bluetooth work without the phone nearby?

No. Time sync and the phone finder need a Bluetooth connection to the Casio Watches app. The watch keeps time on its own otherwise.

The watch, a resin strap and a manual. No charging cable is needed because it charges from light.

Where is the Casio G-Shock (GA-B2100-2A) cheapest?

At CreationWatches, for $135.00, 15% under what the other stores charge, as of our latest check.

Where can I buy the Casio G-Shock (GA-B2100-2A)?

5 stores we checked sell it, including Nubo Watches, CreationWatches, Watchspree, Walmart, Argento.

Casio G-Shock (GA-B2100-2A)

Best price now

$135.00at CreationWatchesChecked 20 h ago

15% under what the other stores charge

Compared across 5 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.

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What reviewers say

Owners treat the GA-B2100 as the sweet spot of the 2100 line: slim, light and solar, with Bluetooth that keeps it accurate. Most complaints center on the small, low-contrast digital window and the plastic feel of the case and strap.

What people mention

Size and weightPraisedOwners say the slim case and light weight make it comfortable for all-day wear.
Solar chargingPraisedReviewers report it keeps running for months on stored charge with normal light exposure.
Digital displayCriticisedThe small negative LCD is called hard to read, especially in low light.
BuildMixedThe Carbon Core Guard feels tough, but the resin case and strap are seen as plasticky.
BluetoothPraisedTime sync and the phone finder are described as quick and dependable.
GlassCriticisedSome owners note mineral glass picks up scratches that sapphire would resist.

About the Casio G-Shock (GA-B2100-2A)

Experience the perfect fusion of iconic design and cutting-edge technology with the Casio G-Shock GA-B2100-2A. This exceptional timepiece brings the legendary 2100 series to life in a sophisticated navy blue colorway, combining analog-digital functionality with modern smartphone connectivity. Built with Casio's renowned Tough Solar technology and Carbon Core Guard structure, this watch delivers reliable solar-powered performance wrapped in a shock-resistant, ultra-durable construction. The sleek 200-meter water-resistant case protects a beautifully designed dial featuring both analog hands and digital displays, all illuminated by double LED lighting for perfect visibility in any condition. Whether you're navigating urban adventures or outdoor pursuits, the GA-B2100-2A keeps you connected and on time with Bluetooth Smartphone Link technology for automatic time updates and seamless app control.Premium Features

Tough Solar power system with approximately 7 months battery life on full charge

Bluetooth Smartphone Link for automatic time synchronization and phone finder function

Carbon Core Guard structure for exceptional shock resistance and durability

200-meter water resistance for swimming, snorkeling, and water sports

Double LED illumination for analog and digital displays

World Time function with 31 time zones and automatic daylight saving time

1/100-second stopwatch with split time capability

Countdown timer for precise time management

Five daily alarms with hourly time signal

Full auto-calendar programmed to the year 2099

12/24-hour time format display

Mineral glass crystal for scratch resistance