Keep your home free of rodents and pests with Pied Piper, the Intelligent Pest Repellent. Built with a microprocessor, Pied Piper emits high-frequency sounds that are unbearable to pests. The ultrasound is not audible to Humans and pets. The sound causes a physiological response, which is characterized by non-directional running and helps prevent pests from settling in your home. Plug this chemical free pest control device and prevent insects and rodents from nesting or feeding in your house.