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The Casio G-Shock GA-B2100 is the Bluetooth and solar version of the slim 2100-series octagonal case, with analog hands over a small digital window. It keeps the tough carbon-core build and 200 m water resistance while adding Tough Solar charging and phone-linked timekeeping. At 52 g it wears lighter than most G-Shocks and far lighter than chunky analog-digital rivals. Owners like the clean look and the set-and-forget solar power; the small digital display and basic step tracking are the usual gripes.
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Owners rate the GA-B2100 as a good-looking, lightweight G-Shock that gains real convenience from solar power and Bluetooth. Most praise the fit and finish for the money; complaints center on the tiny digital readout and modest smart features.
The Casio G-SHOCK GA-B2100-1AJF is an analog-digital watch from the GA-2100 series. It keeps the octagonal form of the original G-SHOCK and adds Smartphone Link and Tough Solar.
A new thin module with an optimized circuit board layout holds the added components. Combined with the carbon core guard structure, it keeps the size of the conventional model. The band is resin.
