Its working principle - This ultrasonic insect repellent emits ultrasonic waves at a frequency of 22-45kHz through dual chips of ultrasonic and electromagnetic waves, interfering with the brain and auditory nervous system of pests, protecting your home from pests, mice, rodents, and mosquitoes.Easy to use - mosquito repellent is easy to use.All you need to do is plug the ultrasonic mosquito repellent into a power outlet, and when the blue night light comes on, it will activate the mosquito repellent.It is recommended to install this mosquito repellent between 30-50 inches above the ground (for flying pests) and 10-30 inches above the ground (for crawling pests).Wide effective coverage - the working area of mosquito repellent can reach 1200 square feet;Due to the fact that ultrasound cannot penetrate walls and solid objects, rodent repellents are placed in every room, and 6-12 units are sufficient to repel pest control indoors (depending on the severity of the infection).Children and pets are safer - the ultrasonic rat repeller works with low-frequency ultrasound, which is hard for human beings to hear. It is an environmentally friendly substitute for dangerous poisons and sprays, chemicals and traps, without odor or corpse, and is very effective for rodents and pests.Effective work - insect repellent works 24 hours a day, 7 days a week.Most customers can see the results within 3-4 weeks.The repeller should be placed in a location where its noise is not affected by walls and furniture.Widely used in homes, warehouses, offices, gardens, hotels, etc.Package a total of 1 product