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The GA-B2100C-9AER is the solar-powered, Bluetooth-connected version of Casio's slim 2100-series G-Shock, the octagonal case nicknamed the CasiOak. It pairs analog hands with a small digital display, charges from light through a solar panel, and syncs the time to a phone through the Casio Watches app. It suits people who want a tough everyday watch with a bright look and don't need the bulk of a full-size G-Shock. Against the original GA-2100 it adds solar charging and Bluetooth, which removes most battery and time-setting chores.
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Owners of the 2100 series praise the slim case and tough build, and the solar and Bluetooth additions are seen as the main reason to pick this version over the standard GA-2100. Complaints center on legibility of the small digital display and the mineral crystal.
The Casio G-Shock GA-B2100C-9AER is an analogue-digital men's watch with a yellow finish and a black dial. The dial is protected by mineral glass. The case is round and made of resin, and the watch is built to be shock-resistant.
It is powered by solar technology and has Bluetooth connectivity. Functions include a stopwatch, world time, an alarm and a day-date calendar. Water resistance is rated at 20 bar.
The case is 46 mm across and 11 mm thick. The yellow plastic band is 24 mm wide and 21 cm long, and it closes with a buckle clasp.
