Description Ecology Safe Non-Toxic- Discard harmful chemical repellents. Ventdest ultrasonic repellent 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- Ultrasonic and electromagnetic wave frequency 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. . More Efficient and Higher Power - Newest repellent 2021 version. 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