What to do about those tiny guests that are too small (or too big!) to fit in a humane mouse trap? Simply insert Plug-In Pest Free into your wall socket and it will create a structured pulse on the wiring that will have them looking for another place to live. It does not affect humans, pets, computers or the electricity flow, and with a lifespan of 10 years, this is a truly humane and environmentally friendly way of saying goodbye to cockroaches and rats. 60-day money-back guarantee.