Powerful Performance: : This latest ultrasonic rodent repeller has two chips, which will emit stronger and more concentrated ultrasonic waves, which will make it harder for pests and rodents to approach than before. Bed bugs, spiders, ants, cockroaches and mice stay away from you Homes! Safety and environmental protection: : The insect repellent does not contain any chemicals, no radiation, no smell, no dead insects, no batteries, and provide you with 100% safety guarantee. Its ultrasound only affects parasites, and ears cannot detect sounds, so it will not interfere or irritate humans and animals! Small and light, wide range of applications :: The new small square design is very cute, cartoon style, only 27g each, ultra-light and stress-free, widely used in homes, warehouses, offices, hotels, etc! Rate effective coverage: : ultrasonic insect repellent is effective indoors less than 1,600 square feet. We recommend installing one unit per room for best and best results. For larger storage areas, we recommend installing 2 or more devices! Easy to use: All you have to do is plug our pest control products into the outlet. It is recommended to insert the flying insect pests 30-50 inches above the ground and the pests 10-30 inches above the ground, then say goodbye to the harmful pests within a month!