The Casio G-Shock GA-100-1A delivers rugged performance built for demanding environments. This analog-digital timepiece combines shock resistance with 200-meter water resistance, making it ideal for active lifestyles. The resin case and band ensure durability without added weight at just 72 grams. Features include world time across 29 zones, a 1/1000-second stopwatch, countdown timer, and five daily alarms with snooze functionality. The amber LED with auto-illumination and selectable afterglow enhances visibility in low-light conditions. Magnetic resistance protects against interference, while the mineral glass face resists scratches. The full auto-calendar runs through 2099, and dual 12/24-hour formats accommodate global users. Includes original box, manual, and one-year manufacturer warranty.