Safe and Effective Physical Technology: The ultrasonic pest repellent drive away insects by specific ultrasonic frequencies without killing them ultrasonic frequency is inaudible to humans and pets, animal-friendly, and safe for children. No chemicals,No radiation pest repeller is the better choice than insect killer, flea spray, bed bug spray, spider spray,ant traps etc. Large Coverage Area: Ultrasonic insect repellent equipped dual microchip system and is suitable for 100 square meters around area. Since ultrasound can not Penetrate through walls and solid objects and to improve the effect, one room one insect repller is recommended. Widely Application: Electronic plug-in pest repellent works great on mice, mosquitoes, ants, rats, cockroaches, spiders, bugs, rodents, etc. Easy to Use: Simply plug pest repeller in a wall socket 8-50 inches away from the floor and keep it vertical to the ground. It works when the green LED night light on. Insect repellent installation should try to avoid carpets, curtains, etc. to prevent affecting the insect repellent effect. Quality Assurance:If you have any problems in the use process, please feel free to contact us, we will give you a satisfactory reply. Please note 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. Ultrasonic pest repeller will take 3-4 weeks to inform us of the good results.