Have effect in 80-120 square meters in the room. Can lustrate house mouse, black beetle, mosquito, ant, etc. Do not harm to human being and pets. Not have affect on house machine. No-toxic, safety and environment protected. Low energy consumption. Ultrasonic frequency to repell the insect. Due to its safety, non-toxic, odorlessness, and high-efficiency, it is widely applied around the world. This product is generally placed in houses, warehouses , shops, hotels, hospitals, offices, computer rooms , gardens, grain depots, and so on.