Based on the original octagonal GA-2100, the GAB2100 is the perfect watch for anywhere from the wild outdoors to the inner city. It has all the rugged toughness you are used to, now with a bluetooth smartphone link and Tough solar power. It features 200M water resistance, carbon case, and a mineral glass face. Measures 48.5mm x 45.4mm x 11.9mm. Because it's a G-Shock, it is shock resistant and built to last a lifetime.