The GA-B2100 is Casio's octagonal CasiOak case with Tough Solar charging and Bluetooth phone pairing. It keeps the analog-digital dial, 200 m water resistance and shock resistance of the GA-2100, but adds solar power and auto time sync through the Casio Watches app. It suits people who want a slim, tough everyday watch that never needs a battery change and sets itself. Against the original GA-2100 it is the more convenient pick; against Bluetooth G-Shocks like the GA-2100 line's non-solar versions, it removes the battery worry. Owners like the light carbon-core case and the legible dial; some find the analog hands hard to read in low light and the app pairing fussy.
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Owners rate the GA-B2100 as a tough, good-looking daily watch and value the solar charging and Bluetooth time sync. Common complaints are weak low-light legibility and a fiddly app pairing process.
The Casio G-Shock GA-B2100 1ACR is the base reference of the GA-B2100 CasiOak line. It is powered by Tough Solar and connects to a smartphone over Bluetooth.
The watch is shock resistant and water resistant to 200 m. It includes world time, a stopwatch and a countdown timer.
