https://bugspray.com/ultra | If you only have a light fixture in your crawl space or attic and want to power on our Ultra Sound Repeller, get one of our Lightbulb Fixture Adapters. Essentially these plug into the outlet and will accept the light bulb BUT have 2 electric outlets. Use one or both for our Ultra Sound repellers since the power demand will be very small and not pose a hazard or overload the circuit.