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The GA-B2100 is Casio's octagonal G-SHOCK with Tough Solar charging and Bluetooth time correction through the CASIO WATCHES app. It keeps the slim 11.9 mm Carbon Core Guard case of the original GA-2100, so it wears smaller than most G-SHOCKs while staying shock resistant and rated to 200 m. The solar cell and phone link are the upgrades over the standard GA-2100, which runs on a battery and has no Bluetooth. It suits people who want a tough analog-digital daily watch without the bulk of a classic G-SHOCK.
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Owners treat the GA-B2100 as the practical version of the CasiOak: the same slim octagon case with solar power and phone-linked timekeeping. Most praise the size, weight and set-and-forget accuracy; complaints center on legibility and the mineral crystal.
The G-SHOCK GA-B2100 is an octagonal solar-powered watch with Bluetooth. It keeps the slim profile of the classic GA-2100 and adds Tough Solar charging. It was released in May 2022.
The case is made of carbon fiber reinforced resin with a resin bezel and a resin band. The Carbon Core Guard structure makes it shock resistant, and the glass is mineral glass. Water resistance is 200 m (20 ATM).
Bluetooth connects the watch to a smartphone through the CASIO WATCHES app for automatic time correction. Functions include world time for 38 cities, a stopwatch, five alarms and an hourly chime.
