(Set of 2) Amzdeal Ultrasonic Pest Repellent/ Insect Mouse Mosquito Rat Repellent/ Electronic Anti Mosquito Rodent Bug Repellent/ Electronic Helminth Machine/ Deworming Device/ White US Plug This device is safety and environment protected, non-toxic, smell-less and flavorless, highly efficient and with advanced photoelectron technology. The ultrasonic that sent out from this machine is far away from hearing range of human being. They will not do harm to human being and pets. Also will not have effect on house machine. It can lustrate house mouse, black beetle, mosquito, flea, fly, cricket, ant, wood ant, etc.. Widely used in family, warehouse, shops, hotels, hospitals, offices, rooms, gardens, hotels, grain depot, etc. It will have great effect in 30 square meters in the room.