The Ultrasonic Pest Repelle uses dual ultrasonic and electromagnetic chips that act in tandem to disrupt the hearing and nervous systems of pests, quickly and effectively driving them away. A wide range of flying and crawling invaders including mosquitoes, spiders, bed bugs, cockroaches, mice, fleas, ants, and fruit flies can be kept at bay. Installation is a breeze - simply plug the repellent into a socket, ensuring it is placed at least 120 cm away from the floor and away from any possible obstructions like curtains or cabinets. Many customers report successful results within 2-3 weeks!