Usefuless area:50-80㎡ Effect Range: 1, this machine will have great effect in 50-80 square meters in the room. 2, this machine can lustrate house mouse, black beetle, mosquito, flea, fly, cricket, ant, wood ant etc vermin. So we can call it electronic lustrate mouse machine, electronic helminthes machine etc. 3, 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 affect on house machine. 4, this machine is safety and environment protected. Smell-less and flavorless. Teeny used energy. (Total power<1W) and with advance photoelectron technology. How to use: After plugging the power on the wall, you can see the blue indicator light and the machine begin to work. Also you can hear electronic scanning sound from high frequency to low frequency. The frequency selected power is on the left side. When you turn it to H , it can lustrate mosquito, black beetle etc small vermin. When you turn to L , it can lustrate mouse. Please select it as products actually function, you will find its effect in several days. The mouse decreases a lot. Maybe you will fine the hexapod increase a little at the beginning use period. Because the ultrasonic evict them from the hiding place. And they will disappear in short time. In 3-6 weeks, you are no need to worry about mouse and vermin. Good situation will keep if you let the machine work all the time. But it just costs you a little for one year. You are no need to buy dangerous chemical medicine and clean the mouse cage. Main caution: 1, this machine should be installed at 20-80 centimeter away from the floor. And should be vertical to the floor and plug to the power socket 2, the installing point should be avoided from carpet, curtain etc attaching sound material. Or else, the decrease of the sound pressure will do harm on the helminthes effect. 3, it is normal that the mouse and vermin will increase at the beginning of the using days. Because they will get away from their living place after the attack of the ultrasonic. 4, this machine can be plug directly to AC 220V (or 110v) power socket. (Power range: AC90V-250V. Frequency: 50HV-60HVZ) 5, Caution: moisture proof, waterproof 6 Do not clean the machine by strong impregnant, water or damp cloth. Use dry and soft cloth with some neuter wash to clean the machine. 7. Do not drop the machine and make strong striking on it. 8, using environment temperature: 0-40degree centigrade 9, To increase the effect, you should use several sets machine at the warehouse or goods pile-up, several rooms. Product Size:10*5*4.5cm Net Weight: 0.081kg Gross Weight: 0.088kg Dimension: 41.5*39*43cm 100pcs/CTN