Fireflyhome CS Plug In Dual Ultrasonic Pest Repeller (4 pack-2) SAFE ATTENTION - Do not use this product in outdoor, hot or humid environment. Do not let the child touch and play equipment while the product is working so as not to touch electricity or cause a safety accident.And don't clean the machine by strong impregnant, water or damp cloth. Use dry and soft cloth with some neuter wash to clean the machine. EASY TO USE: Simply plug our Ultrasonic Pest Repeller into the socket and let it do the rest. Unlike glue traps, mousetraps, poisons or roach motels, our Ultrasonic Pest Repeller will not cause harm or leave nasty situation and dead bodies for you to deal with. Get rid of pests and rodents for good. No more messy cleanup. WIDE APPLICATION & COVERAGE: The pest warrior can be used in different places such as house, office, hotel, supermarket, hospital, warehouse, and so on, which is effective in 50-80 Square meters. One unit for each room is recommended for the best result, because the solid such as wall, furniture and so on, will weaken the effect of ultrasonic wave. UPGRADED ULTRASONIC TECHNOLOGY : The mouse repellent uses upgraded ultrasonic sound to repel mice, spiders, rats, roaches, ants, mosquitoes, fleas, flies, bugs and insects. GUARANTEE: We offer a lifetime warranty and 24 hours customer service, please direct to contact us if there is any question, we will help you solve it. You can easily get your money back if you are still not satisfied with our service or product.