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The Casio G-SHOCK GA-B2100-1A is a slim octagonal analog-digital watch that adds Tough Solar charging and Bluetooth phone linking to the 2100-series design. Its Carbon Core Guard case measures 48.5 x 45.4 x 11.9 mm and weighs 52 g, with 200 m water resistance and mineral glass. It suits people who want a rugged everyday watch with solar power and app-assisted timekeeping without the bulk of older G-SHOCKs. Against the original GA-2100, the main gains are solar charging and Bluetooth; against pricier G-SHOCK models it gives up some sensors and display features but keeps the core toughness.
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Owners of the 2100 series generally praise the slim case, the octagonal look and the tough build. The solar and Bluetooth additions are welcomed as practical upgrades, though some find the analog-digital layout less legible than a full digital display.
The Casio G-SHOCK GA-B2100-1A is an analog-digital watch from the slim, octagonal 2100 series. It has Tough Solar charging and Bluetooth Smartphone Link. The black case and band carry classic blue, green, and red dial accents.
The case is made of carbon and resin and uses Carbon Core Guard shock-resistant construction. It has mineral glass and is water resistant to 200 m / 20 bar.
Paired with the CASIO WATCHES app, the watch adjusts its time automatically. The app also provides simplified watch settings, world time for approximately 300 cities, reminders, time-and-place logging, and a phone finder. On the watch itself, you get world time, a stopwatch, a countdown timer, five alarms, hand shift, and double LED illumination.
