HomeElf electronic pest repeller uses ultrasonic wave technology to drive pests away, disturbing their nerve system making them nervous, which drive pests out of your home for good, it will escape in a few weeks.<br><br>Safe, No Any Radiation , Repel Many Kinds Of Pests<br>Mice, rats, spiders, roaches, mosquitoes, ants ,snakes , rats and so on. None are immune to the sound and completely leave after a few short weeks of use. Our electric pest repellent sound is In-Audible to the human and pet's ear.<br><br>Pests Activity<br>It's normal that the pests will increase at the beginning days because they are getting away from their living place after the attack of the ultrasonic. Reduction in pest activity should occur within 2-4 Weeks.<br><br>Ultrasonic and Electromagnetic Wave Pest Repeller Principle<br>3~5 Days : quick impact & run away from shelter<br>2 Weeks: non-immune & nervous system damaged<br>3-4 Weeks: intolerable & flee from home forever.<br><br>The 3 in 1 Pest Repeller has an <b>intelligent control function</b>. It's no need to turn the whole device off when you plan to clean the insect debris. Just pull out the protective cover, the internal high voltage metal sheet will automatically shut-off to protect you from shock hazard. Once you get rid of the insect debris, and put back the protective cover, the internal high voltage metal sheet will resume working again. The mosquito killer lamp will keep on during this period.<br><br><b>Effective Coverage Area</b><br>Large coverage area up to 800~1200 sq.ft, applicable for big apartmen, garage, kitchen, warehouse, school and parking lot.<br> <br><b>Instruction</b>:<br> <br>1) This machine should be installed at 20~100 cm away from the floor and should be vertical to the floor and plug to the outlet.<br> <br>2) In some cases, pest activities might increase at early stage then disappear after continuous ultrasonic sound attack.<br>