This LED waterproof Penlight is brand new from Greenlee Tools, so you know it's tough. It's size makes it easy to slip into your shirt pocket. Working out side in the weather? Not a problem. The case and LED are sealed against moisture and even the switch is rubber coated and waterproof. You'll find that this small light will easily light up your work area and wiring closets, panels, or equipment racks. The whole light in non-conductive so you can use it inside a running PC case and not have to worry about any short circuits. The 7 Lumen LED has a lifespan of 50,000 hours and you'll get 14-15 hours of battery life from the 2 AAA batteries that are included in the package. The LED light is even water proof to 3 feet.