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The GA-B2100 is the Bluetooth and solar version of Casio's slim 2100-series G-Shock, the octagonal case modeled on the original DW-5000C. It adds Tough Solar charging and Bluetooth phone link for automatic time sync and a phone finder, on top of 200 m water resistance, world time and a 1/100-second stopwatch. The Carbon Core Guard case keeps it lighter and slimmer than a classic square G-Shock, so it slips under a cuff. It suits people who want a rugged everyday watch with analog hands and a digital display and no battery changes, and it is the practical step up from the non-solar GA-2100.
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Owners rate the GA-B2100 as a well-built, comfortable daily watch that fixes the main gripe about the original 2100 by adding solar power. Most praise the slim case and the Bluetooth timekeeping; complaints center on legibility of the small digital display and the phone app.
The Casio G-Shock GA-B2100-2A is a men's analog-digital watch with a navy blue resin case and band. It is part of the 2100 series and has a compact octagonal case. The dial is black and is protected by a mineral glass crystal.
It runs on Tough Solar power, with a power reserve of approximately 7 months from full charge to power save. The Carbon Core Guard structure gives it shock resistance. The case is water resistant to 200 meters (20 ATM), and double LED lights illuminate the analog and digital displays.
Bluetooth Smartphone Link sets the time automatically and includes a phone finder function. The watch has World Time with 31 time zones and automatic daylight saving time. It also has a 1/100-second stopwatch with split time, a countdown timer, five daily alarms with an hourly time signal, and a full auto-calendar programmed to the year 2099. It shows time in 12- or 24-hour format.
