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The GA-B2100 is the Bluetooth and solar version of Casio's octagonal G-SHOCK, the 'CasiOak'. It pairs with the Casio Watches app for automatic time correction and phone finding, and its Tough Solar cell charges from light so you rarely need a battery swap. It keeps the 200 m water resistance, shock-resistant case and analog-digital display of the standard model. Against the original GA-2100 it adds solar charging and Bluetooth; against pricier G-SHOCKs it gives up features like a sapphire crystal and multi-band radio. Owners like the slim case and the look; some find the analog hands and negative LCD hard to read in low light.
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Owners rate the GA-B2100 as a tough, good-looking daily watch with the convenience of solar and Bluetooth. Common complaints are legibility of the hands and LCD in low light and the plastic feel of the strap.
The Casio G-SHOCK GA-B2100-1ADR is a watch with Bluetooth connectivity. G-SHOCK watches have been built around Casio's shock-resistant construction since 1983.
