Ultrasonic protective agent with intelligent double chip design destroys the central olfactory and nervous system of pests and rodents. This type of ultrasound can make rats, spiders, flies, fleas, ants, and other types of rodents and insects very uncomfortable, driving them out of our homes and habitats. No chemicals, non-toxic, odorless, silent and radiation-free. Ultrasonic waves and transmitted electromagnetic waves have no effect on pregnant women, children and pets, ultrasonic sound is inaudible to humans and pets. It drives away pests and rats without killing them, leaving dead insects or nasty rodents behind. Easy to use: Connect the devices to power outlets at a height of 10 to 40cm from the floor. The ultrasounds are inaudible. Install a repellent in each room. Please note that ultrasonic waves cannot pass through walls. Although our pest repeller works well, if you have a large infestation we recommend placing our insect repellent in every room. Wide Effective Coverage