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The GA-B2100 is Casio's slimmed-down analog-digital G-Shock with solar charging and Bluetooth time sync. It keeps the octagonal case and 200m water resistance of the classic 2100 line but adds a solar cell and phone link, so you rarely need to reset it or change a battery. At 52 g and 11.9 mm thick it wears lighter than most G-Shocks, which suits people who want toughness without bulk. Against non-solar 2100 models it adds charging and app control; against pricier G-Shocks it gives up metal cases and advanced sensors like barometer or compass.
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Owners praise the GA-B2100 for its slim case, solar charging and set-and-forget timekeeping. Many call it the best-value entry into the 2100 line, though some find the resin build less premium than metal versions and the hands less legible than a pure digital display.
The Casio G-SHOCK GA-B2100-1A is a solar-powered analog-digital watch for men. It has a shock-resistant construction and a 200m (20 bar) water resistance rating, which is dive-capable and suitable for recreational scuba. Avoid operating the buttons underwater unless the Casio manual for this model allows it.
The case is carbon and resin, and the band is resin. The crystal is mineral glass. The Tough Solar system charges the battery from light. A power saving function and a battery-level indicator are included.
Bluetooth Mobile Link connects the watch to a compatible phone for automatic time adjustment. Other functions include world time, a stopwatch, a countdown timer, alarms, a double LED light, and a phone finder.
