The CAT S31 smartphone is built to survive. Its high-quality rugged materials mean you can drop it dirty it or dunk it in water and your S31 will keep on working for you. It s packed with features that help in harsh or outdoor environments including a screen optimized for use in direct sunlight or when wet. Never lose power again with a 4000 mAh battery that lasts. The CAT S31 is a truly rugged phone that can handle whatever s thrown at it.