The model that we bought at Harbor Freight didn't work. This yellow bug light has been certified by the FCC, RoHS, Energy Star and UL. It has been designed with the highest quality standards in mind to ensure its performance. Finally, the plastic around the grid prevents you and the kids (and any other small animals that wander up to your campsite) from getting shocked. It's certainly entertaining to use, but it's not very practical and, honestly, not all that effective. If problems persist, consult the manufacturer or seek professional assistance. You can install most models indoors and outdoors (though you'll probably have to make sure that the unit will be able to stay dry for obvious reasons). But if you could shrink one down to the size of a light bulb, you could easily dot them around the porch using the existing sockets and wiring. Replace your old bulbs with new ones to keep your DynaTrap(r), models DT1120, working as efficiently as possible. To access the official Electrizap website and explore the product further, you can find relevant links and references in this comprehensive ElectriZap review.