[Ultrasound Repellent] -This is our advanced version. Using ultrasound theory, change frequency in order to stimulate the hearing system of mosquito and other pests, make them unbearable and feel uncomfortable. [Safe and Environmentally Friendly] -Without poison, chemicals, traps and no killings, the pest repellant is 100% safe and harmless. It is a physical method to drive away parasites, non-toxic, environmentally friendly and absolutely safe for children and pets, a pest control combining advanced technology and humanitarian. [Large coverage area] -Each electronic ultrasonic repellent is effective for a large area up to 800-1300ft². Please note that ultrasonic waves cannot pass through walls. Although our pest repellent works well, if you have a large infestation we recommend placing our insect repellant in every room. [Plug-And-Play] -You can simply plug the Electronic Ultrasonic Pest Repeller into a wall outlet without any tools. The manufacturer suggests using one unit for about
