VEPOWER Ultrasonic Pest Repeller, Electrical Bug Repellent, Non-Toxic Spider Repellent Plug in Pest Control Indoor for Mosquito Spider Ant Mice Roach Other Insect (2 Packs) 2019 Upgraded Ultrasonic Pest TechnologyPest control uses ultrasonic frequency (22-65Khz) sound waves to drive pest and rats away without killing them. Usually ultrasonic repeller takes 3-4 weeks to make effect. this pest control ultrasonic can help you drive away all the Pest, like spiders, mice, mosquitoes, rats, roaches, ants, snakes and so on. [HUMAN & PETS SAFE CONTROL] If you don't wanna use spray or traps, our pest repeller plug in will be your best choice. It only works on pests and has no chmicals, no radiation and no toxic which give you the safest assurance to protect you and your family.It drives pests out without killing but detering [WIDE APPLICATION RANGE] Our Rodent Repeller has a wide coverage which upp to 1700 sq.ft. Due to its limitation of transmitting through hard barriers, we recommend you to install one unit in each of your room which will take the best effects of it. It can widely be used in offices, garages, kitchens, basements, warehouses, restaurants, etc. [JUST PLUG IT] Just plug it in your wall socket, the insect electronic repellent will start working with blue light on. Be careful to get out of reach with children. Its input voltage is between 90V to 250V, this rodent repellent can bear a temperature range between 32-104 . [QUALITY GUARANTEE ASSURANCE] Just directly contact our after-sale service team if you have any questions or quality problem(route:store page -&gt; "ask questions" -&gt; contact). Our ultrasonic spider repellent is backed by our Lifetime guarantee because we want to help you get rid of those pests and we offer a money back guarantee if you dont see results within 4weeks. Typical results can take 3-4 weeks depending on the amount of infestation.