Casio G-SHOCK GBM-2100A-1A2DR blends rugged durability with advanced timekeeping. Powered by Tough Solar and featuring Bluetooth, it delivers 200 m water resistance, world time for 29 zones (48 cities + UTC), five daily alarms, auto calendar to 2099, and a combined analog-digital display. A LED backlight with adjustable duration, a precise stopwatch (1/1000 s) with multiple modes, a countdown timer, and a 12/24-hour format complete its feature set. The gray resin case and black strap are paired with a mineral glass face for lasting performance.