This ultrasonic repeller can act upon the hearing and the nervous system of the mice, rats and insects to make them unpleasant and uncomfortable and forces them to leave your home.It is effective for an area up to 100~150 Square Meters. This product is widely used in homes, warehouses, shops, hotels, hospitals, offices, rooms, gardens, hotels, etc.The ultrasonic frequency that sent out from this machine is inaudible to human beings and pets. It is absolutely safe for children, family and pets.All you have to do is plug it in and it will start working. Specification:Repels Bugs, Ants, Mice, Cockroaches, Mosquitoes, Spiders, Rats, and MoreNon-toxic& Environment-friendlyStandard Wall Plug-InIndoor Use OnlyUltrasonic Frequency:20~55KHZPower Source: AC90~220(V)Power: 5WEffective coverage area: 100 - 150 square meters