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The Casio G-Shock GA-B2100 is a slim analog-digital G-Shock with Tough Solar charging and Bluetooth smartphone pairing. It keeps the octagonal case shape of the original 2100 series but adds a Carbon Core Guard structure for shock resistance in a compact case. It suits people who want a tough everyday watch that never needs a battery swap and syncs its time to a phone. Against the non-solar GA-2100 it adds solar power and Bluetooth, and it costs less than metal-cased G-Shock models while giving up their steel build.
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Owners of the 2100 series praise the slim case, the legible analog-digital layout and the solar-plus-Bluetooth combination. Many call it the best-value G-Shock for daily wear. Some find the resin build and small digital window less satisfying than metal models.
The Casio G-Shock GA-B2100-1A1ER is a men's watch in an all-black colorway. It uses G-Shock classic colors first seen on the G-Shock 5600 models.
Its Carbon Core Guard structure protects the module. It gives the watch shock resistance in a compact case.
The Tough Solar system turns light from any light source into power, so the battery does not need to be replaced. Bluetooth pairs the watch with a smartphone for accurate timekeeping.
