About Product:This Product Adopts High-Tech Means, Which Can Produce an Extremely Special Ultra-Low Electromagnetic Wave. Through the Transmission of Its Own Transmitting Elements and Power Lines, It Can Effectively Stimulate the Nervous System and Auditory System of Pests Such as Cockroaches, Ants, Spiders, Fleas and Bugs Within the Control Range, make It Uncomfortable and Escape. 2. According to the Principle of Ultrasonic Wave, This Product Generates Variable Frequency Ultrasonic Wave to Effectively Expel Indoor Pests Such as Mice and Mosquitoes."