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The GMA-S2100 is Casio's smaller take on the octagonal GA-2100, aimed at wrists that find the original too bulky. It pairs analog hands with a digital window and a day-of-week dial, in a white resin case and band with silver accents. It keeps the core G-Shock package: shock resistance, 200 m water resistance, five daily alarms, a stopwatch and an auto calendar, at roughly 11 mm thick. Against the full-size GA-2100 it trades some wrist presence for comfort; against fashion watches it wins on toughness but loses on materials, since the case and band are resin, not steel.
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Owners of the GMA-S2100 line generally like the smaller size and the clean one-tone dial, and treat it as a tough daily watch. Common complaints are the resin feel and the white color picking up marks.
The Casio G-Shock GMA-S2100-7AER is an analogue-digital watch from the 2021 GMA-S2100 collection. It is a smaller version of the GA-2100, with a 3D one-tone dial, an octagonal bezel, a digital display and a day of the week dial. The colors are white with silver accents.
The case and band are resin. The watch uses a Carbon Core Guard structure, and its Hollow Core Guard structure protects against impact and vibration. A double LED light illuminates the face and the digital display. Neobrite coating on the hands lets them glow in the dark.
Functions include five daily alarms, a stopwatch, a countdown timer, an automatic calendar and World Time. The World Time function covers approximately 300 cities through CASIO WATCH+.
