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The GA-B2100-1AER is Casio's octagonal 'CasiOak' G-Shock upgraded with Tough Solar charging and Bluetooth link to the CASIO WATCHES app. The carbon-core case measures 48.5 × 45.4 mm and just 11.9 mm thick, so it wears slimmer than most G-Shocks. It pairs analog hands with a digital display, adds 200 m water resistance, a 1/100-second stopwatch, countdown timer, five alarms and Super Illuminator double LED light. It suits people who want the steel-look octagon style with solar power and phone-corrected time, and it undercuts metal-cased rivals on features per gram.
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Owners rate the GA-B2100 line highly for its slim octagonal case, solar charging and Bluetooth timekeeping. Most praise the looks and everyday comfort; some find the digital display dim and the resin strap basic.
The G-Shock GA-B2100-1AER extends the GA-2100 series of octagonal cases, which inherit the concept of the very first G-Shock. It adds Smartphone Link and Tough Solar power. The all-black, retro look sits on a carbon and resin case with a black resin strap.
The display combines hands with a digital screen, and the hands can be hidden. The watch has mineral glass and the Carbon Core Guard structure. It is water resistant to 200 m, for swimming and snorkeling.
Over Bluetooth, the watch connects to the CASIO WATCHES app. The app sets the time automatically and manages world time for 300 cities and reminders. The watch also has a stopwatch with 1/100-second precision, a countdown timer, five alarms and dual LED Super Illuminator lighting.
