• JUCHENG ultrasonic pest repeller uses automatic frequency conversion technology to emit ultrasonic waves of 20 ~ 55 KHZ. • Stimulates the auditory and nervous systems of mosquitoes, cockroaches, mice, mites, and other pests to effectively drive them away. • Safe for humans and pets, as the human ear cannot hear frequencies above 20KHZ. • Wide coverage of 80-120 square meters, ideal for homes, warehouses, offices, supermarkets, hotels, etc. • Plug-and-Play, simply plug in the device and it will work when you notice the misty glow. • It is recommended to install one device per room, as ultrasonic waves do not penetrate walls. • Includes 4 packs, no need for cleaning dead pests or batteries. • Effective against mice, rats, mosquitoes, cockroaches, moths, ants, spiders, bedbugs, and more. • Suitable for apartments, warehouses, offices, restaurants, schools, garages, gyms, and more.