The Big Cheese Advanced Pest Repeller will deter rodents from coming near your home, in a humane & eco-friendly way. It’s safe for use around children & household pets. This device plugs into any normal socket, & it combines electromagnetic & ultrasonic technology to drive away rats, mice & other pests. It will protect any area up to 37 sq meters around where it’s activated. The electromagnetic signals will not disrupt any other electronics around you house. There is a test button & an LED indicator to show when it’s activated.