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The GA-B2100 is Casio's solar-powered, Bluetooth-connected take on the slim CasiOak case, at 11.8 mm thick and 52 g. It pairs Tough Solar charging with the CASIO WATCHES app for automatic time correction, roughly 300-city world time and phone finder, plus 200 m water resistance and dual Super Illuminator LEDs. It suits people who want a tough everyday watch with analog hands and smart timekeeping without a rechargeable smartwatch. Against the original GA-2100 it adds solar power and Bluetooth; against G-Shock's square models it trades the digital-only display for analog hands and a thinner profile.
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Owners of the GA-B2100 line praise the solar-plus-Bluetooth upgrade over the original CasiOak and the slim, comfortable case. Common complaints center on the app and on reading the small analog hands in low light.
The G-SHOCK GA-B2100-1A1JF is a digital-analog watch with a carbon fiber core guard construction. It is lightweight and durable without being bulky. It is solar powered and connects to a phone over Bluetooth.
The watch connects to the "CASIO WATCHES" app for automatic time correction and easy clock setting. The app also provides world time for approximately 300 cities, time and location reminders, and mobile phone search. The watch itself shows the time in 38 cities (38 time zones), with automatic daylight saving adjustment, UTC display and a home city exchange function.
It has a timer set in 1-second increments up to 60 minutes, 5 alarms per day and an hourly time signal. A dual LED with Super Illuminator lights the dial and the LCD. The afterglow can be set to 1.5 or 3 seconds. The fully automatic calendar accounts for leap years, so the date needs no adjustment.
