【2021 UPDATE TECHNOLOGY REPELS INSECTS AND RODENTS】: The dual ultrasonic and electromagnetic chips of our ultrasonic pest repellers emit frequencies ultrasonic interfering the auditory and nerve system of the pest, making them feel uneasy and uncomfortable to remove pests, mice, rodents, mosquitoes and more from your home while the rodent repellent is safe to use around pets or kids. •【ECO-FRIENDLY & SAFE FOR HUMAN】: The ultrasonic frequency of the mosquito repellent is inaudible to humans and pets, environmental-friendly, and safe for children. Unlike fly zappers and sprays, our plug in bug repellent doesn’t eliminate bugs but instead removes them from the coverage area without using chemicals or smoke making it ideal for anyone that doesn’t want to deal with lengthy cleanups. •【SIMPLE TO INSTALL & USE】: Just plug the ultrasonic pest repellers into the socket. If the mosquito repellent displays a blue light and flashes, it means the pest repeller is working normally. No battery required, just plug pest reject and play. Please make sure to install it vertically 10-50 inch away from the floor. And make sure there are no barriers like curtains or cabinets covering in front of the ultrasonic pest repeller. •【WIDE EFFECTIVE COVERAGE AREA】: Each ultrasonic pest repeller plug provides 1500- 2000 Sq. ft. area coverage making it the perfect choice to use in your bedroom, bathroom, kid’s room, kitchen, office and anywhere else you have in mind to repel pests in a easy way. Installing 1 bug repellent per room is recommended as ultrasound can not penetrate through walls and solid objects. For large and vermin place, you can plug two or more insect repellent.