1.Easy to use - just plug the electronic pest control ultrasonic repellent into an electrical outlet; When the blue light comes on, it will start to repel the pests.2.Safer for children and pets - humans and household pets cannot hear ultrasounds and are an environmentally friendly alternative to dangerous poisons and sprayers, chemicals and traps, free of foul smells and dead bodies.3.Easy to use - To install our ultrasonic insect repellent, you simply plug it into an electrical outlet. When the blue LED night light comes on, it means the device is working and this ultrasonic rodent and insect repellent has started to drive pests out of your walls, floors, cellars and attics.4.This ultrasonic pest control device operates silently, so you can easily install it in the children's room, bedroom or guest room. It is recommended to install 1 device per room. Note that ultrasound cannot travel through solid materials and walls, so do not place furniture or any other object in front of it and keep doors and Windows closed to allow the ultrasound to expand and work.5.Low Noise -- This insect repellent emits ultrasonic waves far beyond the range of human hearing. Enjoy a quiet, worm-free, tight sleep without worrying about noise, and let your family have a good night's sleep amid the noise.