The GA-B2100 is Casio's slimmer, solar-powered take on the octagonal CasiOak look, with Bluetooth phone link for automatic timekeeping and settings. It pairs a 46mm resin case with a blue resin strap, 200m water resistance and full stopwatch, countdown timer and world time functions. Against the original GA-2100 it adds Tough Solar and Bluetooth while keeping the same lightweight carbon-core build. It suits people who want a tough everyday watch with analog-digital styling and no charging routine.
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Owners of the GA-B2100 series praise the solar charging and Bluetooth convenience in a slim, tough package. Many like the CasiOak styling and light weight, while some find the digital display dim and the resin strap basic.
The Casio G-Shock GA-B2100 CY-1ADR, known as the CasiOak, has a blue resin strap and a 46mm resin case. Its octagonal case bezel is the defining design element, and the nickname refers to its resemblance to the Royal Oak.
The watch charges with Tough Solar power. It connects to a smartphone over Bluetooth through the Move Link app. It is shock resistant and water resistant to 200m, and it includes world time, a countdown timer and a stopwatch.
