The GA-B2100 is Casio's octagonal G-Shock, the CasiOak shape, now with Tough Solar charging and Bluetooth phone link. It keeps the slim carbon core guard case of the original GA-2100 while adding a battery indicator, power saving and automatic time sync through the Casio Watches app. The analog-digital dial, 20-bar water resistance and shock-resistant build suit everyday wear and light sports. Against the plain GA-2100 it adds solar and Bluetooth without growing much on the wrist; against metal-cased G-Shocks it is lighter and less expensive in feel.
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Owners like the CasiOak look and the step up to solar and Bluetooth. Many mention the light weight and slim case for a G-Shock. The common complaints are legibility of the small LCD and the need for the app to get the most from the Bluetooth link.
The G-Shock GA-B2100-1AJF keeps the octagonal shape of the GA-2100 and adds Tough Solar charging and smartphone link. A new thin module with an optimized board layout holds the extra parts. Combined with the Carbon Core Guard structure, it keeps the size of earlier models.
It has an analog-digital display with a black dial, a resin case and band, and an inorganic glass crystal. The shock-resistant build is water resistant to 20 bar. A double LED light illuminates the dial and the LCD, and the hands can move out of the way of the digital display when it is hard to read.
Bluetooth links the watch to a compatible smartphone through the free CASIO WATCHES app. The app provides automatic time adjustment, easy watch setup, world time for about 300 cities, Time & Place, a reminder and a phone finder. Without a smartphone connection, the watch runs at normal quartz accuracy.
