G-Shock Watch Classic Precious Heart Mens GM-2100WS-7AER. Remember, every G-Shock is 200m water resistant, drop shock & vibration resistant together with featuring multiple alarms, stopwatch and countdown timer & world time. Established in 1983 G-Shock has been worn & trusted by fashion, pop culture, utility, military and sports circles the world over for decades. The toughest watch of all time.