The Casio G-Shock GA-2100-1A4ER is a slim analog-digital G-Shock with a carbon core guard case and a black resin band. At 11.8 mm thick it wears much flatter than classic square or chunky G-Shocks, which is why the GA-2100 line became a favorite everyday beater. It brings shock resistance, 200 m water resistance, world time across 31 time zones, a 1/100-second stopwatch, a countdown timer and double LED illumination. It suits people who want a tough, low-maintenance watch that looks sharp with casual clothes, and it undercuts metal-case analog G-Shocks on weight and bulk while giving up their steel finish and solar charging.
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Owners of the GA-2100 line praise its slim, light build and tough feel for the money, and many call it their daily watch. Common complaints are the hard-to-read negative digital display and the resin strap, which some find stiff and prone to scuffing.
The Casio G-Shock GA-2100-1A4ER is an analog watch with a carbon and resin case and a resin band. The case and dial are black. It has a shock-resistant structure and is water resistant to 200 meters.
The watch has world time for 31 time zones, with daylight saving adjustment. It also has a 1/100-second stopwatch and a countdown timer. A double LED light lets you read the time in low light, with a choice of illumination durations.
It keeps time to within ±15 seconds per month. The full auto-calendar runs to the year 2099. It has 5 daily alarms and an hourly time signal.
