Ecology Safe Non-Toxic- Discard harmful chemical repellents. Ventdest ultrasonic repeller is 100% safe and works effectively. The most advanced ultrasonic technology can expel them to eliminate pests without killing them. Eco-friendly and you don't need to clean up dead insects. Can drive out a wide variety of insects such as rats, mosquitoes, insects, cockroaches, spiders and more. . Innovative Frequency Conversion Technology - The frequency of ultrasonic and electromagnetic waves are converted and combined. Therefore, pests and mice cannot develop immunity and adaptability to insect repellent. With a new physics simulation of bionic waves, using mouse cries and meows of physical threats, forcing the rat fled from the scene. . Most Efficient and High Power - Newest repellent version 2021. With more power (20W), it is more efficient than the normal 5/8W on the market. Latest triple wave frequency conversion technology. Ultrasonic and electromagnetic waves is able to effectively repel cockroaches, rodents, mice and other pests by affecting their auditory nervous systems. . Amazing Coverage Area- Electronic Pest Control can cover the area up to 80~120 square meters. It can be effective for the indoor area, but it can't go through walls, so a mouse repellent for each room will be better. . LIFETIME WARRANTY- Our products are guaranteed to give customers 100% satisfaction. We promise you a ZERO risk purchase. 100% refund without resending within 48 months if the goods are not satisfied .