The Pest A Cator line of pest control devices uses sonic waves and vibration to repel rodents. They cause a slight phase shift in the timing of the electromagnetic field surrounding the wiring in the home, causing discomfort to pests and rodents. The PestVacator uses the same technology as the Pest A Cator, but transmits ultrasonic signals. The signal penetrates the nervous system of pests, but not humans or pets. The Pest A Cator Ground Rodent Repeller is a solar-powered unit that generates sonic waves and vibration to control ground rodents in lawns.