[Advanced Ultrasound Technology]: Mouse repellent made with the latest chip to increase the intensity of ultrasound, it emits ultrasonic waves which vary continuously in the range of 22kHz to 65kHz. Can make rats , spiders,flies, fleas, ants and other types of very uncomfortable rodents and insects and drive them out of our homes and habitats [No chemicals added]: Rat repellent no radiation, harmless, non-toxic, wide coverage, ultrasonic waves can't penetrate walls. We recommend installing one device per room [Easy to Use]: Can cover an area of 80-120 square meters, just plug the insecticide into any electrical outlet (at least 12 inches off the ground) and it's ready to use use. This insecticide can be used in anywhich house can be powered, such as kitchens, bedrooms, basements, garages, warehouses, etc. [Package]:You will receive 4 EU plug ultrasonic pest repellents at the best price in sufficient quantity for you to use in different places