Casio's product development is to create something where there was nothing before - what Casio calls going from "0" to "1." Casio exploded conventional wisdom with the concept for a shock-resistant watch. The G-SHOCK was born. Firmly footed in the "All-Around Tough" concept, Casio has developed this product over time, adding new and exciting features. Casio fitted the watch with solar cells, which will never run out of power anywhere there is a light source.