The Casio G-Shock GA-2100 is a slim analog-digital G-Shock known as the "CasiOak" for its octagonal bezel. Its Carbon Core Guard case uses carbon and resin for shock resistance, and it runs about three years on two SR726W batteries. It suits people who want a tough everyday watch with a sporty look, and it is thinner and lighter than most G-Shock models. Owners praise the build and styling; the common complaints are the small digital display and the recessed buttons.
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Owners rate the GA-2100 highly for its tough build, light weight and clean octagonal design. Many call it the best-looking G-Shock for daily wear. The usual complaints are the small digital display and stiff, recessed buttons.
The Casio G-Shock GA-2100-4AER is an analog-digital watch built around the Carbon Core Guard structure, which gives it shock resistance. The case and bezel are made of carbon and resin. It is water resistant to 200 meters.
The display combines analog and digital readouts. Two hands show the hour and minute, and a dial shows the day. The digital display shows hour, minute, second, pm, month and date. A white LED lights the display in low light.
The watch has a stopwatch and a countdown timer. It runs on two SR726W batteries, with a battery life of about 3 years. Accuracy is within ±15 seconds per month.
