The revolutionary Riddex Pest Repeller turns the wiring in the walls into an invisible pest repelling force. Cockroaches, rats, rodents and even the cutest mice is not exactly the idea of a house pet. Riddex Pest Repellers patented microprocessor uses electromagnetic technology to creates an uncomfortable, irritating environment for pest that helps drive those pesky pests right out of your house. Pests are not killed they just leave. Riddex Pest Repeller helps control unwanted pests safely.