Intelligent Variable Frequency --- To prevent pests from adapting to a single type of sound wave, Enttgo ultrasonic pest repeller uses variable frequency ultrasonic waves to constantly stimulate pests, making it impossible for them to live quietly and forcing them to choose to leave your home. Ultrasonic pest repeller can drive away mosquitoes, rats, cockroaches, bed bugs, spiders, ants, mice and other rodents. Effective Pest Repeller --- In 1-2 weeks, you may notice that pest activity has increased as they have been constantly disturbed by the uncomfortable ultrasonic waves, making it difficult for them to live peacefully and forcing them to seek out new places to live. After 2-4 weeks, you will find that these troublesome rodents have left your house. Safe and Eco-friendly --- Unlike other traditional toxic insecticides. Ultrasonic waves are only effective against pests and are inaudible to humans and pets. Pest control process is quiet, odorless, and radiation. Ultrasonic pest repellent is safe for your family and pets, and environmentally friendly. You don't have to worry about it affecting your daily life, and it won't pose a threat to human health. Easy to Us --- This device has no switch and is easy to use - simply plug the pest repellent into a power outlet and it will start working when the night light turns on. You don't have to worry about it automatically turning off and allowing pests to reappear. Wide Coverage --- The coverage area of ultrasonic can reach 1200 square feet and it can be used in any indoor environment, such as house, warehouse, garage, supermarket, office, restaurant, factorie, and hospital. Ultrasonic waves cannot penetrate solid surfaces, so please keep one pest repeller installed in one room. If the area is too large or the pest infestation is severe, it is recommended to use two or more ultrasonic pest repellers to ensure the pests are quickly driven away.