Pest Control Direct has been selling pest repellers and electronic pest control products for over 12 years and have found them to be effective in controlling many pest problems. There are electro-magnetic, ultrasonic pest repellers and electronic pest killers. Indoor pest repellers can be effective at deterring mice, rats and some insects. Electronic rat killers and mouse killers electrocute the rodents. Outdoor ultrasonic devices can drive away cats, dogs, foxes and other mammals!!