1This machine will have great effect in 50-80 square meters in the room 2Multi-function: can generate extremely low frequency induction field, ultrasonic and infrared, it is a more comprehensive electronic insect repeller 3Frequency conversion: Three kinds of electric waves frequency generated by this product is constantly changing intermittently, so that the pests and other pests will not be able to be adaptive and immunized with a fixed frequency. Get more obvious effect 4The 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 affect on house machine 5This machine is safety and environment protected. Smell-less and flavorless. Equipped with advance photoelectron technology, during the day, the night light will be automatically turned off, and it will automatically light up after the light is turned of