The American Red Cross Clipray is great for emergency kits or outdoor adventures. You will always have light and power for your smartphone—the best thing is no batteries needed! Crank the Clipray for one minute and you will have enough power for 10 minutes of light. When you need power for your smartphone, simple crank it and use a standard USB port. No batteries required for light and power! It even has a built-in carabiner to clip on your belt or backpack for convenient hands-free use.