VEPOWER 2018 Upgraded Ultrasonic Electronic Repellent, Pest Repeller Plug Control in Indoor Usage, Best Pest Controller to Bugs, Insects Mice, Ants, Mosquitoes, Spiders, Rodents and Roach(6 Packs) [2018 Newest Pest Repellent control technology]: With the latest pest control Ultrasonic and Electro Magnetics technology, each pest repeller plug in uses electromagnetic and ultrasonic sound waves disturbing their central nervous systems, pest, mouse, rats, spiders, fleas, roaches, bed bugs, mosquitoes have nowhere to hide and they will be repelled effectively. [Wide Effective Coverage]: This Pest control repeller is effective for an area up to 800~1200 Square Feet. Please note that ultrasonic waves cant travel through walls and solid stuff. Installing one pest repellent in one room is recommended. [Easy Usage and effective]:It works plugging the pest repellent into the socket and the breath light starts to work with flicker. Pests will be repelled and drove away within 3-4 week with using this pest repellent. Make sure that there are no barriers like curtains or cabinets covering in front of the pest repeller for a perfect effect. [Environmental - Friendly]:This ultrasonic pest repellent is only audible to pests. Humans and pets wont be effected, and there is no harm to pregnant women and children. But if you keep hamster as a pet in your house, please use it carefully. [100% Satisfaction & Product Warranty]:We devote ourselves to provide superior after-sale service and guarantee 100% refund for quality issues. Please contact us if there is any problem of our pest repellers.