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The GA-2100K is a special-edition version of Casio's slim 'CasiOak' analog-digital G-Shock, finished in piano-black tones with neon accents and a matte translucent bezel and band. It keeps the standard GA-2100 formula: carbon core guard construction, shock resistance, 200 m water resistance, world time, stopwatch, countdown timer, alarms and a double LED light, in a case just 11.8 mm thick and 51 g. That makes it one of the thinnest, lightest G-Shocks you can wear daily, and it slips under a cuff where chunkier 5600 and GA-110 models won't. The trade-off is the usual one for this line: a busy analog-digital dial that some find hard to read at a glance, and no Bluetooth or solar charging. Buyers of the GA-2100 family praise the looks, comfort and toughness; the common complaints are legibility and the resin band's long-term wear.
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Owners of the GA-2100 line consistently praise the slim, comfortable case, the tough build and the distinctive look. The most common criticisms are dial legibility and the lack of solar or smart features.
The G-Shock GA-2100K-2AER is an analogue-digital watch built on the GA-2100 case. It has a piano-black dial with a refined surface finish and neon accents. The bezel and band are matte and translucent.
The case and bezel are made of carbon and resin, with a Carbon Core Guard structure for shock resistance. The band is resin and the crystal is mineral glass. The watch is water resistant to 200 metres.
Two LED lights illuminate the face and the digital display. Each has a selectable duration of 1.5 or 3 seconds, plus afterglow. A hand shift feature moves the hands out of the way so the digital display is unobstructed.
