About this item If you're looking for a non-chemical way to keep pests out of your home, we recommend the Ultrasonic Pest Repellers. These devices emit a consistent high frequency noise that is too high for humans to hear. The sound waves are designed to disrupt, irritate, and deter common household pests like roaches, spiders, mosquitoes, ants, and rodents. With intelligent multi-frequency ultrasonic conversion systems, pests have nowhere to hide. This latest rat repellent will help you get rid of rats in your home, office, storage room, warehouse, and other places. Using ultrasonic waves to repel rats can replace traditional methods such as toxic chemicals, hazardous drugs, and traps. It is an environmentally friendly and safe choice that has no impact on humans and pets and does not produce unpleasant odors. This ultrasonic pest control operates silently so you can calmly set it up in a childs room, bedroom, or guest room. Each device can effectively cover and control an area of up to 800~1200 sq.ft. One device per room is recommended. Note that ultrasonic waves cannot pass through solid materials and walls, so do not place furniture or any other objects in front of it and keep doors and windows closed to allow ultrasonic waves to expand and work. & Simply plug into an electrical wall socket. You can completely get rid of mosquitoes, fleas, ticks, mice, moths and so on. No need to clean up dead bugs and keep your home always clean.