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Insect repellent 1. The machine should be installed at a distance of 20 to 80 cm from the ground, and it must be plugged into the power socket at right angles to the ground. 2. The installation site should try to avoid sound-absorbing materials such as carpets, curtains,etc.to prevent the reduction of sound pressure and make the sound domain smaller and affect the insect repellent effect. 3. Within the first few days of use,it is a normal phenomenon if mice,pests,and other activities are significantly increased.Because the rats and insects usually hiding in the lair were attacked by ultrasonic waves and electromagnetic waves,they fled their original hiding place; 4. The unit is directly inserted into the AC mains outlet for use (use voltage range:AC90V ~ 250V,frequency: 50Hz ~ 60Hz); 5, Note: moisture,waterproof; 6, do not use strong solvents,water or a wet cloth to clean the body,please use a dry soft cloth dipped in some neutral detergent to clean the body; 7. Do not drop the unit or subject it to strong impact; 8, the use of ambient temperature: 0 ~ 40 degrees Celsius; 9, if placed in the warehouse or stacked items,or multi-room floor,should put a few more units in order to increase the effect. Package Includes: Insect repellent X 2 Size:90*56*50 weight:0.2kg How to use it: The machine should be installed 30-50 inches above the ground. Please do not place the machine next to the carpet and other additional sound materials so as not to affect the machine.