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The Casio GA-2100-2A2 features a shock-resistant carbon core guard structure with a bio-based resin case and strap. The watch has a blue dial with an analog-digital display, quartz movement, and mineral crystal protection. Measuring approximately 45.40 mm in diameter and 11.80 mm in thickness, it includes luminous hands, a screwed case back, and a buckle clasp, offering 200m water resistance. Key functions include world time (31 time zones), day and date display, a 1/100 second stopwatch, countdown timer, 5 daily alarms, double LED light, and a full auto calendar.