Highendberry  Pest Repeller, Pest Control Ultrasonic Repellent, Non-toxic Spider Repellent, Pest Repellent Plug in Spider Repellent Indoor for Mosquito Spider Ant Mice Roach and other Insects (6 packs) [Newest Eletronic Ultrasonic Chip]-- Adopts modern micro-electronic technologyour electronic pest repellent plug in can create changeable ultrasound intermittently and alternately will will influences on the auditory and nervous system of insects such as mice, rats, spiders, ants, bugs, cockroaches, mosquitoes, fruit flies, flea, crickets, insects and rodents. They will escape spontaneously from the area that the ultrasonic covered. [Safe For Human & Pet]-- Based on physical pest detering technology, this pest reject is your best choice to say goodbye to the pests without harmful poisons, dangerous chemicals spray, and traps. It is 100% safe and effective. The Ultrasound just work on pests but not pets and human. Besides, it will not influence the daily life of humans and pets. The mosquito control has no chemicals, non-toxic, no radiation, odorless and noiseless. [Wide Appliction & Effective]-- The pest reject ultrasonic repeller is effective in an indoor area up to 1700 sq.ft. You can use them in your bedrooms, warehouses, kitchens, offices, gardens, etc. One unit one room is recommended, because the ultrasound could not go through walls and solid objects.For serious pests problem, we suggest install 2 or more devices in one room.Usually it takes 4 weeeks to competely repel the pests. [Work Once Plug in]-- Just plug the bug repellent indoor into the socket, and the red light will be on, which means it is working. Please make sure there are no barriers like curtains or cabinets covering the repellent. It's normal that the mouse and vermin will increase at the beginning of the using days because they are getting away from the living place after the attack of the ultrasonic. Usually, it could take 3~4 weeks to notice results. [Tips & Guarantee Assurance]-- Do not use this product in outdoor, hot or humid environment and get out of the touch of children and pets. We provide a professional technical support and guarantee with 100% refund or replacement for quality problems within 60 days.