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The GA-B2100-1A1DR is Casio's octagonal G-SHOCK with two upgrades over the original GA-2100: Tough Solar charging and Bluetooth smartphone link. The Carbon Core Guard case keeps it thin at 11.9 mm and light at 52 g, with 200-meter water resistance and shock resistance. It suits people who want the slim 'CasiOak' look with solar power and app-based timekeeping. Rivals like the plain GA-2100 cost less but need battery swaps and have no phone link; the Bluetooth module adds convenience without changing the case size much.
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Owners of the GA-B2100 line praise the slim octagonal case, solar charging and light weight. Many note the display legibility and resin materials as the main compromises.
The G-SHOCK GA-B2100-1A1DR is part of the octagonal GA-2100 line, which follows the design concept of the very first G-SHOCK. It adds Smartphone Link and Tough Solar power. The case and bezel are made of carbon and resin, and the band is resin.
The watch has a Carbon Core Guard structure and is shock resistant. It has mineral glass and 200-meter water resistance. It links wirelessly to a smartphone over Bluetooth®.
It shows world time for 38 time zones and includes a 1/100-second stopwatch, a countdown timer, five daily alarms and an hourly time signal. A double LED light and a full auto-calendar to the year 2099 are also included.
