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Easy to Use Simply plug the device in to household power socket vertically. Installing the devices 30-70 inch from the floor is recommended. The blue LED light illuminate, indicating the device is working.. Wide Effective Coverage This Insect Rodent Repellent is effective in an indoor area up to 1600 sq. ft. Its widely used in homes, warehouses, offices, gardens, hotels, etc. We recommend you to install one for each room because the ultrasound cannot penetrate walls and solid objects. But for areas with serious pests, we suggest install 2 or more devices for other room. They aren't effective for other rooms if you install device at one room.. Driving Most Kinds of Pests The Pest Repeller keeps all kinds of insects away from your house, which works great for Spiders, Mosquitoes, Bed bugs , Cockroaches , Mice , Fleas and some other rodent pests.. Safe And Economical - Different from chemical, this product is safe for human and pets. It uses ultrasonic frequency 22 - 50Khz sound waves to drive pest away and you can see a difference after 3 - 4 weeks of use.. Maximum GuardC Plug in this ultrasonic pest repeller with its newest electromagnetic ultrasonic wave technology, it will drive all the pests away from your home. These waves are disturbing central nervous systems from pest.