The GA-2100 is Casio's slimmest G-SHOCK, an analog-digital watch in a resin case with the Carbon Core Guard structure and a 200-meter water rating. At 11.8 mm thick and 51 g it wears far flatter than the chunky square and mudmaster-style G-SHOCKs, while keeping world time, a 1/100-second stopwatch, a 24-hour timer and five alarms. It suits people who want G-SHOCK toughness in a watch that slips under a cuff. Against pricier G-SHOCK models it gives up solar charging and Bluetooth, running about three years on two SR726W batteries.
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Owners rate the GA-2100 highly for its thin, light case and its tough build at a modest outlay. Many call it the most comfortable G-SHOCK they have worn. Complaints center on legibility of the dark dial versions and on the resin band aging.
The G-SHOCK GA-2100 Series is an analog-digital watch. It inherits the octagonal shape of the first-generation DW-5000C model in a thinner case. The design is simple, with a three-dimensional dial and large front buttons.
The case is made of resin containing carbon fiber, which is lightweight and more rigid than normal resin. The Carbon Core Guard structure helps prevent damage and deformation from impacts to protect the internal module. A two-layer back cover guards against impacts to the back of the watch. The shock-proof button structure lets the exterior go without a button guard.
The analog hands shift out of the way to give an unobstructed view of the digital display. Double LED lights illuminate the face and the digital display, with a selectable duration of 1.5 or 3 seconds and afterglow. The watch is water resistant to 200 meters.
