1. Ultrasonic Technology with Upgraded Chip: Adopting the ultrasonic chip to impact mice, rats, spiders, fleas, cockroaches, ant, flies, mosquitoes on their hearing and nervous system to make them unpleasant and uncomfortable, which will drive them away from your home and make them don't dare to come close to your home anymore. What's more, this pest repellent won't kill the pests. 2. FRIENDLY AND ECONOMICAL - This electronic pest repeller is friendly for human and our lovely pets like dogs and cats. Odorless, noiseless and no radiation.Pest control uses sound waves to drive pest and rats away without killing them leaving nasty dead insects or rodents behind for you to deal with. 3. Easy to Use and Install: Simply plug in our ultrasonic pest repeller, It works when you notice the hazy glow. This machine should be installed 10-30inch away from the floor, and no other obstacles around within 1 meter. 4. Coverage Area: The maximum coverage of our ultrasonic pest repeller is up to 1200 square meters. Due to the solid walls that will weaken the effect of the ultrasonic wave, we suggest using 1 unit per average-sized room with a pest problem. Additional units will be required in larger areas. 5. Multipurpose&Energy-Saving: Costs less than 10 a year in electricity, but can save hundreds in dangerous pesticide spraying. Suitable for living room, bedroom, kitchen, store, house, warehouse, garage home, apartment, shed, tenants, and more.