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The GA-B2100 is the Bluetooth and solar version of Casio's octagonal 2100 line, which borrows the shape of the original 1983 G-SHOCK. It adds Tough Solar charging and a Smartphone Link that sets the time and handles alarms and world time from the Casio Watches app. The case is carbon-core guarded and rated to 200 meters of water resistance, with analog hands plus a digital window. It suits people who want a rugged everyday watch with a retro look and don't want to change batteries. Against the standard GA-2100 it adds solar and Bluetooth; against a square G-SHOCK it is slimmer and more analog, but the hands and small digital display take more reading than a full digital screen.
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The G-SHOCK GA-B2100-1AJF is an analog-digital watch from the octagonal GA-2100 line. The line follows the design concept of the very first G-SHOCK. This model adds Smartphone Link over Bluetooth and Tough Solar power.
The case uses a Carbon Core Guard structure, and the shock-resistant build protects against impact and vibration. The band is resin and the crystal is mineral glass. The watch is water resistant to 200 meters.
A dual illuminator lights the analog and digital parts separately in low light. The hands have a luminescent Neobrite coating. A hand shift function moves the hands away from the LCD so the display is clear. Tough Solar power runs the watch from any light source, so no battery change is needed.
