Dual Ultrasonic Pest RepellerUltrasonic pest repeller indoor features a frequency conversion dual-wave technology. It can simulate and interfere with the auditory and nerve system of the mouse and pest, being extremely irritating to them. Especially the variable technology frequency waves ensure that the pest can't develop immunity and adaptability to the sounds, keeps pests and rodents away from your home or office. Wide CoverageEach ultrasonic pest repeller device can cover around 1600 square footage of the area. You can use it in any room, garage, warehouse, office, garden, backyard, restaurant, kitchen, etc. The coverage area for the pest repeller is enormous, but it cant penetrate the walls. So, if you use it in a closed room, we recommend getting one for each room. Human and Pet SafeThe insect repellent works by emitting ultrasound waves which has a frequencies between 25KHz and 65KHz, ultrasound waves emitted by this pest repeller will definitely not bother human and pets, even pregnant women and babies, and produce no noise or unpleasant odors,so you do not have to worry about harming their health.Can also be used as a night light. Easy Set-UpSimply plug the electric pest repeller devices into any plug socket (product plugs match household sockets) at the recommended height of between 10 and 40 inches above the floor and they will start working when the blue night light comes on. Please make sure there are no barriers like curtains or cabinets covering in front of the repellent devices.NoteOur ultrasonic repellent takes 3 or 4 weeks to see visible results. Say Goodbye to PestsOur pest control device meets the epa requirements and has been proved by them,it is super quiet when working,and has less power consumption, no battery needed, also no need to deal with the chaos of pests.If you have any problems, please feel free to contact us; we hope you sleep comfortably and have a pest-free environment.