This cute little flashlight is perfect for all outdoor uses. It's super simple and easy-to-build design makes it great for a personal or class project! Two 5mm LEDs pop into the front. Solder these in series and then add a 120-240 ohm resistor to make sure they don't blow out! Next, two screws function as terminals. The 9V battery pops into the back and once the rear cap is installed, simply twist the back to turn it on!