1. The machine shall be installed 20 ~ 80 cm above the ground, and shall be inserted into the power socket perpendicular to the ground2. There shall be no tall obstacles within 1 meter of the front of the product (that is, it shall not be installed on the back of refrigerators, wardrobes, sofas and other objects).3, the installation point should avoid carpets, curtains and other sound-absorbing materials as far as possible, to prevent the reduction of sound pressure to make the sound domain smaller and affect the effect of insect repellent;4. In the first few days of use, if rats and pests are found to increase significantly, it is a normal phenomenon. Because the mice and insects that usually hide in the nest are attacked by ultrasonic and electromagnetic waves, and they flee their original hiding place.5, attention: moisture-proof, waterproof;6, do not use strong solvent, water or wet cloth to clean the fuselage, please use a dry soft cloth dipped in some neutral detergent to clean the fuselage;7. Do not drop the machine or make it hit strongly;8, the use of ambient temperature: 0 ~ 40 degrees Celsius;9, if placed in the warehouse or goods pile place, or multi-room floor, should be put a few more units, in order to increase the effect.