The Casio G-Shock GA-2100-7A is an analog-digital timepiece, showcasing a robust carbon core guard structure for shock resistance. With dimensions measuring 48.5 x 45.4 x 11.8 mm and a weight of 51 g, the Casio G-Shock GA-2100-7A features a resilient carbon + resin case and bezel, accompanied by a matching resin band. Its design ensures easy visibility in low-light conditions, and its lightweight yet sturdy build exudes a sporty aesthetic. Boasting world time functionality covering 31 time zones (48 cities + Coordinated Universal Time) and the option for daylight saving on/off, the watch further includes a 1/100-second stopwatch, a countdown timer, and 5 daily alarms. It integrates a double LED light with a white hue, ensuring illumination in the dark. Additionally, the watch incorporates a full auto-calendar up to the year 2099, a mute feature, and adheres to a high accuracy level of ±15 seconds per month. The defining feature of the Casio G-Shock GA-2100-7A lies in its resilient shock-resistant carbon core guard structure, establishing it as a durable and reliable choice adaptable to various environments.