【Variable Frequency】: The latest powerful 8W repeller, capable of emitting 22-72khz ultrasonic waves, in addition to our repeller is equipped with a visual time display real of the ultrasonic frequency, in order to prevent the noise from being used with a fixed frequency, the microcomputer automatically changes the frequency intermittently. Making 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. Thus our mouse repellent flickers through the lights to scare away the mouse and (lightness adjustable in 3 levels). This is different from the mouse repellent on the market. What makes our products more effective 【Large coverage area】:Each electronic ultrasonic pest repellent is effective over a large area. Which is much more powerful than other cheaper repellents. Please note that ultrasonic waves cannot pass through walls. Although our insect repellent works well, if you