SAFE PEST CONTROL: This new device uses environmentally friendly frequency conversion ultrasonic waves to interfere with the central nervous system, taste, hearing and visual nervous systems of pests. Without killing critter and no poison, no more need to prepare various mouse poison, mouse traps, mouse mats, rat glue traps, roach motels, cockroach bait, rat poison, raccoon blocker and insect sprays. Get rid of annoying insects. MULTI FUNCTIONS: The rat repellent with 4 modes can meet all your needs. Different light colors represent different functions, and you can choose the appropriate mode to use according to the environment. For example, you can choose silent mode in thebedroom. Using the rodent repellent to repel critters is a humane pest control solution. EASY TO USE: Easy to install and easy to carry, just plug it vertically into a wall socket 11.8 inch - 23.6 inch above the ground. And adjust the mode according to the needs of the environment to achieve the best repelling effect. No poison and harmfulto human and pets. EFFECTIVE COVERAGE AREA: The effective coverage is wide. The maximum effective range of ultrasonic mouse repellent is 800~1600 sq. ft in one single room. If there are multiple rooms in your house, it is recommended to install one per room to protect yourhome more effectively. WIDE APPLICATION: The product works long term and you will see noticeable improvement after 4 weeks. Effective deterrent against rodent infestation. Suitable for attic, house, home, indoor bedroom, warehouses, storage rooms, shops, offices, restaurants,classrooms, hotels, hospitals, garages, etc.