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The GA-B2100 is Casio's slimmed-down G-Shock with a carbon core guard case, Bluetooth phone linking and solar charging. It brings the octagonal 2100 silhouette into the connected era while staying under 12 mm thick and around 52 g. It suits people who want a tough everyday watch with automatic timekeeping and a phone finder, but who do not need the full analog hands or the bulk of the larger GA-110. Against the original GA-2100, the additions are Tough Solar and Bluetooth; against pricier G-Shocks, it gives up multi-band radio and sapphire.
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Owners like the slim, light case and the solar-plus-Bluetooth combination. Many say the display and hands are less legible than expected, and some find the app pairing fussy.
The Casio G-Shock GA-B2100-2ADR is a shock-resistant watch with a carbon and resin case, a resin band and a mineral glass crystal. Its Carbon Core Guard structure protects the module, and it is water resistant to 200 meters.
It is powered by Tough Solar, so it runs on solar power. It connects wirelessly to a smartphone over Bluetooth® and works with the CASIO WATCH app. Through the app, it adjusts the time automatically and offers practical watch settings, including a reminder and a cellphone finder.
