Ultrasonic 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) Eletronic Ultrasonic Technology -- The electronic pest repellent plug in adopts modern micro-electronic technology can create changeable ultrasound intermittently and alternately. Influences on the auditory and nervous system of pests such as mice, rats, spiders, ants, bugs, cockroaches, mosquitoes, fruit flies, flea, crickets, insects and rodents through unique ultrasonic waves. They will escape spontaneously from the area that the ultrasonic covered. Safe For Human & Pet -- Say goodbye to the harmful poisons, dangerous chemicals spray, and traps. This pest reject ultrasonic repeller is 100% safe and effective. The Ultrasound will not influence the daily life of humans and pets. Besides, the mosquito control has no chemicals, non-toxic, no radiation, odorless and noiseless. Wide Effective Coverage -- The pest reject ultrasonic repeller is effective in an indoor area up to 1700 sq.ft. Its widely used in 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. Easy To Operate -- Just plug the bug repellent indoor into the socket, and the blue light will be on, which means it is working. Please make sure there are no barriers like curtains or cabinets covering the repellent. According to the customers saying, generally it will take effects within 2-3 weeks, then all the annoying pests will disappear! Safe Attention & 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 professional technical support and guarantee 100% refund or replacement for quality problems within 60 days.