??Variable Ultrasonic: The latest powerful 8w repellent designed to automatically emit 22-74khz ultrasonic sound, in addition to our repellent is equipped with a double horn, in order to prevent pests from being used at the fixed frequency, the microcomputer automatically changes the frequency intermittently. Make the product both effective and intuitive for you??Scary LightsAccording to experiments, mice are inherently very resistant to light and like dark and humid environments. So, our mouse repellent flickers through the lights to scare the mouse and escape. This is different from the mouse repellent on the market. Which makes our products more effective??Large Coverage AreaEach electronic ultrasonic repellent is effective for a large area up to. 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 heavy infestation, we recommend placing our insect repellent in every room??Safe and Quiet: Non-toxic and eco-friendly ultrasonic repellent, our repellent is 100% safe and effective, the ultrasonic frequency emitsby this machine is inaudible to humans and pets. Safe for children, family and pets. However, if you have a pet hamster at home, do not use this ultrasonic repeller??Easy to useThis machine should be installed 20-120 centimeters from the ground. And vertical to the ground and plug it into the pr . It can be plugged directly into a pr220V AC. Can be widely used in homes, warehouses, shops, hotels, hospitals, offices, etc. Save your costs as much as possible.