NIUNIU Safer protection: Ultrasound destroys the living environment of pests and affects both pests and mice. For childrenbrregnant women/elderly peoplebrets, repellent is safe, quiet and non-radioactive. EASY TO USE: Our insect repellent is easy to use, just plug it into a wall outlet a few inches from the floor. There is no noise during use, and the smart night light creates a warm and comfortable environment for you. And make sure there are no obstructionssuch as curtains or cabinets in front of the ultrasonic repellent. Wider scope of application: widely used in homes, warehouses, offices, gardens, hotels, etc. We recommend that you install one per room, as ultrasonic waves cannot penetrate walls and solid objects. However, for heavily infested areas, we recommend installingtwo or more units in other rooms. If devices are installed in one room, they have no effect on other rooms. Litter-free: With pests like insects, rodents, and bugs out of the house, you don't have to worry about areas that need to be cleaned up like you would with spray pests, unlike chemicals that need to be swept away with repellents .