Hearing from mice and other pests, make them unbearable and feel uncomfortable. Wide Coverage Area - Ultrasonic Mouse effective for large area up to 800-1300ft. Please note that ultrasonic waves cannot pass through walls. Although our ultrasonic repellent works well, if you have a large infestation, we recommend placing our insect repellent in every room. Easy to use - This machine should be installed 80-120 centimeters from the floor. And vertical to the floor and plug into the power outlet. It can be plugged directly into the AC 110V power outlet (power range: AC 90V-250V Frequency: 50-60HZ). Commonly used in homes, warehouses, stores, hotels, hospitals, offices, etc. Large areas may require more than one unit. Environmental and safety friendly - The product is non-toxic and environmentally friendly, our repeller is 100% safe and effective, the ultrasonic frequency emitted by this machine is inaudible to human beings and pets. Safe for kids, family and pets. However, if you have a pet hamster at home, do not use this ultrasonic repeller.