Description: How it Work - This pest repeller sends out 22-45KHz frequency ultrasonic waves through dual ultrasonic and electromagnetic chips to interfere with the pest's brain and auditory nervous system, making your home free from pests, mice, rodents and mosquitoes infringe. Easy to Use - Insect repellents are simple to use. All you do is plug pest repellent ultrasonic in an electrical outlet and it will start to repel the pests when the blue night light is on. It is recommended to install this pest repeller between 30-50 inches away from the floor for flying pests and 10-30 inches from the ground for crawling pests. Wide Effective Coverage - The Mosquito Repellent effective area can be up to 1200 sq feet; Please put a single mouse repellent in each room because the ultrasonic waves cannot penetrate walls and solid objects, 6-12 units are enough to repel pest control in the house (depending on the severity of pest infestation) More Safe for Child & Pets Ultrasonic pest repellers work with low frequency ultrasonic waves, which are difficult for humans to hear, environmental friendly alternative to dangerous poisons and Sprayers, chemicals and traps, no bad smell and Corpses, It is very effective for rodents and pests. Efficient Work - The pest repellent will work 24 hours a day, 7 days a week. Most customers can see the results within 3-4 weeks. The repeller should be placed in a location where its noise will not be affected by walls and furniture. It's widely used in homes, warehouses, offices, gardens, hotels, etc.Products include: 6* mosquito and mouse repellent