[360PROECT YOUR HOME WITH NO DEAD ZONE]: Our pest repellers have an effective coverage of up to 1200 ft, providing full 360protection for your home or office. However, since ultrasonic sound cannot penetrate walls and solid objects, we recommend using one unit per room for maximum effectiveness. Our pest repellers are widely used in homes, warehouses, offices, restaurants, supermarkets, hospitals, granaries, and more. [QUIET PEST CONTROL]: Our Ultrasonic Pest Repeller emits high-frequency sound waves that are too high for humans to hear. These waves are designed to distract, annoy, and deter common household pests like roaches, spiders, mosquitoes, ants, and rodents. Our intelligent multi-frequency ultrasonic conversion system makes it impossible for pests to hide. [NO MESS, NO-RISK PURCHASE]:Our pest repellent will instantly shoo away harmful pests without any mess or odor. No need to clean up dead pests, no bad smell and Corpses, no battery required, and save a lot of money. Results can typically be seen within 2-3 weeks, depending on the severity of the pest infestation. If you have any problems or questions, please feel free to contact us. We stand behind our product and want to ensure you have a pest-free environment. [KIDS &PETS-FRIENDLY]: Our rodent repellent is a better pest repellent choice for kids and pets. Unlike traditional pest repellents, our ultrasonic sound waves are inaudible to humans and household pets. With no smell or chemicls, our pest repellents are significantly friendly and harmless for kids, pregnant women, and pets. [EASY TO USE, ONE UNIT PER ROOM]: Our pest repellents are simple to use. Just plug them into an electrical outlet, and they'll start repelling pests when the blue night light turns on. Place the ultrasonic repellent in a location where its wave won't be affected by walls and furniture. For flying pests, we recommend installing the repeller between 30-40 inches away from the floor, and for crawling pests, install it between 8-12 inches from the ground.