Human and pet friendly: This ultrasonic pest repeller is completely safe for people and pets. Good damaging effects on mice, cockroaches, spiders, mosquitoes, insects, rats, rodents, flies, ants, fleas and other pests. High technology: Based on the principle of defense against physical pests, which uses the latest dual chip, this mouse repeller emits different ultrasonic wave frequencies to irritate the nervous system of insects and rats, making them feel uncomfortable and making them gradually flee. Intermittent changes in ultrasonic frequency prevent them from developing immunity and adaptability. Easy to use: simply plug the electronic ultrasonic repeller into the socket for pest control and it will start to repel the pests when you see that the blue night light is lit. Gives a sense of security when you are sleeping in the dark night. Lightweight and widely used: the ultrasonic pest repeller is portable and easy to install, just plug and play. Widely used in households, warehouses, offices, hotels, etc. Energy saving, no battery required and saves a lot of money. Large coverage: the effective cover of each pest control is up to 20-50 square metres. It is recommended to install this pest repeller 20-80 cm vertically from the floor. For best results, you should equip each room with a pest repeller.