Newest chips technology- this indoor ultrasonic pest repeller emits invisible electromagnetic waves to expel insects, rats, mosquitoes, ants, spiders, cockroaches, and other insects. pests will now be scrambling to find a way out of your home please note that our ultrasonic repellents work between 3-4 weeks to make an effect depending on the amount of infestation. then we can say goodbye to pests and mice.^Wide effective coverage- the pest repellent is effective in an indoor area up to 1600 sq. ft. it's widely used in homes, warehouses, offices, gardens, hotels, etc. ^we recommend you to install one for each room because the ultrasound cannot penetrate walls and solid objects. but for areas with serious vermin, we suggest install 2 or more devices for other room.^Safe & economical-it is designed for environmental protection and 100% safe for pregnant woman and baby. odorless, noiseless, and no radiation. just drive them away without killing them, an environment-friendly and humane solution to keep the pests away from your home.^Easy to use-just plug the pest control repellent into the socket. please make sure to install it vertically 7-31 in away from the floor. and make sure there are no barriers like curtains or cabinets covering in front of the repellent. most customers can see the results within 2-3 weeks then we can say goodbye to vermin^