How it works: Works through ultrasound that stimulates the brain and auditory nervous system, powerfully driving most types of pests. Less power consumption: no need to clean up dead bugs, no odors and carcasses, no batteries, save a lot of money. Easy to use: just plug the electronic pest control ultrasonic repeller into the power outlet; when the blue light is on, it will start to drive away the pests. Wide Coverage: Place one in every room, as ultrasound cannot penetrate walls and solid objects. Quiet and effective: Ultrasonic insect repellent uses low frequency ultrasonic waves, no noise in the room to affect you and your pets. Note: 1. The machine should be installed at a distance of 20 to 80 cm from the ground, and it is required to be inserted into the power socket perpendicular to the ground; 2. The installation point should avoid sound-absorbing materials such as carpets and curtains as much as possible to prevent the reduction of sound pressure from reducing the sound range and affecting the insect repellent effect; 3. In the first few days of use, it is normal if mosquitoes, mice, pests and other activities are found to increase significantly. Because the mice and insects that usually hide in their nests are attacked by ultrasonic and electromagnetic waves, they have fled their original hiding places; 4. The machine is directly inserted into the AC mains socket for use (voltage range: AC90V ~ 250V, frequency: 50Hz ~ 60Hz); 5. Note: moisture-proof and waterproof; 6. Do not use strong solvent, water or 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 machine or subject it to strong impact; 8, the use of ambient temperature: 0 ~ 40 degrees Celsius; 9. If it is placed in a warehouse or a place where items are stacked, or on a multi-room floor, several more units should be placed to increase the effect.