Variable Frequency: The latest designed powerful 8W repeller, capable of emitting 22-72khz ultrasonic waves, in addition to our repeller is equipped with real-time visual display of ultrasonic frequency, in order to prevent parasites from being Used with a fixed frequency, the microcomputer automatically changes the frequency intermittently. Make the product both efficient and intuitive for you Scary Lights: According to experiments, mice are inherently very light-resistant and like dark and humid environments. So our mouse repellent flickers through the lights to scare the mouse and (lightness adjustable on 3 levels). This is different from the mouse repellent on the market. What makes our products more effective Large coverage area: : Each electronic ultrasonic repellent is effective for a large area. Which is much more powerful than other cheaper repellents. Please note that ultrasonic waves cannot pass through walls. While our insect repellant works well, if you have a large