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The GA-B2100 is Casio's octagonal G-SHOCK, a slimmer, lighter take on the classic 2100 case with Tough Solar charging and Bluetooth phone link added. It is analog-digital, 200 m water resistant, and built on a Carbon Core Guard resin case that weighs about 52 g. That makes it a strong everyday pick for people who want G-SHOCK toughness with a cleaner, dressier look than a chunky digital. Against the original GA-2100 it adds solar power and phone connectivity, which are the two upgrades most owners care about.
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Owners rate the GA-B2100 highly for its light, slim case and the solar-plus-Bluetooth upgrade over the original 2100. Common complaints are legibility of the small digital window and the resin band wearing.
The G-SHOCK GA-B2100-1AJF is an analog-digital watch with an octagonal case that follows the design of the original DW-5600. It has an all-black look with a monochrome dial, white numerals and a red accent. The dual-layer LCD has an enhanced texture, and the crystal is mineral glass.
The case is carbon-core resin with a Carbon Core Guard shock-resistant structure. It weighs about 52 g and is 11.9 mm thick. The black resin band adjusts from 145 to 215 mm and closes with a three-fold clasp.
Tough Solar charging powers the watch. It also connects to a smartphone over Bluetooth through the CASIO Watches app, which adjusts the time automatically four times a day. A Super Illuminator double LED backlight lights the display in the dark, and the watch is water resistant to 200 m.
