The improvements come with improved low frequency waves, which are safer for humans and pets and won't disturb your sleep at night. It includes sound generators that mimic predators, repelling foxes and raccoons with bionic waves. For highly infested areas, use 5 units of repellent to effectively eliminate insects and pests. Here are the advantages of flea treatments for cats and dogs. Clean and NeatUnlike traditional pest defense technology that kills pests, this electronic pest repeller repels pests and forces them out of your house. Latest Chip TechnologyThis indoor supplement emits invisible electromagnetic waves to repel insects, rats, rats, mosquitos, ants, spiders, cockroaches and other insects. No need to kill them. Please note that our ultrasonic repellent will work within 3 to 4 weeks, depending on the number of infestation. Then we can say goodbye to vermin and rats. WIDE AND EFFECTIVE COVERAGEInsect and rodent repellent is effective in indoor areas up to 1600 square feet. It is widely used in home, warehouse, office, garden, hotel and so on. We recommend that you install one for each room, as ultrasound cannot penetrate walls and solid objects. But for areas with heavy infestation, we recommend installing 2 or more units in other rooms. If you install devices in one room, they will not work in other rooms.