20-65 kHz Ultrasonic Pest Control - Physical Repellent: Change the frequency using ultrasound theory to stimulate the hearing system of mosquitoes and other pests, making them unbearable and uncomfortable. High-frequency ultrasonic circuit, not only for mosquitoes, but also against most rodents, such as insects such as cockroaches, ants, spiders, and mice. No stimulation for humans and animals. No chemicals added - energy-saving and environmentally friendly: no radiation, harmless, non-toxic, with wide coverage, ultrasonic waves cannot pass through walls. Scope of application: theaters, restaurants, supermarkets, department stores, hotels, furniture stores, hospitals. We recommend installing a device for each room. Easy to use - plug our electronic mice into the socket and let the rest do the rest. And should stand vertically on the ground and be connected to the socket. These invisible ultrasonic waves are harmless to people and pets. so it can be used safely. [Cover a large area and