Upgrade the retro look you love with the octagonal GA-2100 line, inheriting the iconic design concept of the very first G-SHOCK with modern enhancements. This model is equipped with Smartphone Link connectivity and Tough Solar power for reliable, accurate timekeeping.

Built with a Carbon Core Guard structure, the shock-resistant carbon fiber-reinforced resin case offers high strength, lightness, and excellent weather resistance. The dual-layer dial construction highlights the dimensionality of the LCD and inset dial with meticulous textured surface treatments.

Featuring 200-meter water resistance and a high-brightness Super Illuminator double LED light, this watch pairs seamlessly with the CASIO WATCHES smartphone app for automatic time adjustment, world time across over 300 cities, reminders, and phone finder capabilities.

Key Features

Case size (L× W× H)	48.5 × 45.4 × 11.9 mm
Weight	52 g
Case and bezel material	Carbon / Resin
Band	Resin Band
Construction	Shock Resistant, Carbon Core Guard structure
Water resistance	200-meter water resistance
Time adjustment	Bluetooth: Connects to a smartphone and automatically adjusts the time
Power supply and battery life	Tough Solar (Solar powered)
Illumination	Double LED light (Super Illuminator)
Stopwatch	1/100-second stopwatch
Timer	Countdown timer
Alarms	5 daily alarms
World Time	38 cities

Highlights

Shock resistant
20 bar water resistant
Timekeeping functionality
Stable solar power
Smartphone connectivity
Illuminated display for low-light visibility

Frequently asked questions

How is the GA-B2100 powered?

It is powered by Tough Solar technology, which provides stable solar-powered timekeeping.

What is the water resistance rating of this watch?

The watch features a 20-bar (200-meter) water resistance rating.

What smartphone connectivity features are available?

Through Bluetooth and the CASIO WATCHES app, it offers automatic time adjustment four times a day, world time for over 300 cities, time and place logging, reminder settings, and a phone finder.

What materials are used for the case and band?

The case and bezel are made of carbon and resin with a Carbon Core Guard structure, paired with a resin band.

What are the dimensions and weight of the watch?

The case measures 48.5 × 45.4 × 11.9 mm and the watch weighs 52 g.

Does the watch have illumination for dark environments?

Yes, it is equipped with a high-brightness Super Illuminator double LED light for easy visibility in darkness.

Casio G-Shock Retro Black Dial Digital Watch GA-B2100-2ADR