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 infestation we recommend that you place our insect repellant in every room Safe and Quiet: Non-toxic and environmentally friendly ultrasonic repellent, our repellent is 100% safe and effective, the ultrasonic frequency emitted by this machine is inaudible to humans and pets. Safe for children, the family and pets. Indeed, an idea to get rid of the hassle of rats and parasites Easy to use This machine should be installed 20-30 centimeters from the ground for rats. And vertical to the ground and plug it into the outlet. It can be plugged directly into a 220V AC outlet. Can be widely used in homes, warehouses, stores, hotels, hospitals, offices, etc. Save your costs as much as possible