The Pestrol Rodent Free uses a combination of ultrasonic, electromagnetic and ionic technologies to get rid of rodents from your home. In addition to rat and mice control, this device can also help control cockroaches. Pestrol Rodent Free is chemical free, family and pet safe, easy to use and requires no maintenance from the user - just plug it in and let it do its job. Electromagnetic Pest Control utilises the existing wiring within the walls of your home or building by simply sending a pulsing or shifting signal through the wires, this is tuned to irritate the pests nervous system. The signal is turned on and off at set intervals so the rodents and cockroaches will not build up a tolerance. Electromagnetic vibrations from the unit are picked up by the rodents and cockroaches. Making it difficult or impossible for them to gather food, breed and build their nests, and communicate with each other. As a result, your home becomes an extensive pest repeller and all rodents and cockroaches will want to escape and stay away.