Variable Frequency: The latest designed 8W powerful repeller, capable of emitting 22-72khz ultrasonic waves, in addition to our repeller is equipped with real-time visual display of ultrasonic frequency, to prevent pests from being used with a fixed frequency, the microcomputer automatically changes the frequency intermittently. Making the product both effective and intuitive for you Scary Lights: According to experiments, mice are inherently very resistant to light 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 areaEach electronic ultrasonic pest repeller is effective for 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 have a large infestation, we recommend placing our insect repellent in every room Safe and Quiet: Non-toxic and eco-friendly ultrasonic repeller, our repeller is safe and effective, the ultrasonic frequency emitted by this machine is inaudible to humans and pets. Safe for children, family and pets. Indeed, an idea to get rid of the hassle of rats and pests Easy to useThis 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 socket. Can be widely used in homes, warehouses, stores, hotels, hospitals, offices, etc. Save your cost as much as possible Note: The data is manual measurement, please allow 1-74cm error, due to the light and screen differences, there will be a certain color difference, the specific received in kind prevail.