[Effective] ultrasonic insect repellent stimulates the auditory nerve with ultrasound in the frequency range and the central nervous system of pests and rodents. Mouse ultrasonic emits high-frequency ultrasonic waves that effectively repel rodents. [Wide Area of Use] Each ultrasonic insect repellent has an effective range of up to 800- 1300ft². It is recommended to install this plunger 32-47 inches from the ground. When installing the device, there should be no obstacles in the immediate vicinity. [Safe and Environmentally Friendly] Free of poisons, chemicals, traps and without kills, the pest repeller is 100% safe and harmless. It is a physical method to expel pests, non-toxic, environmentally friendly and absolutely safe for children and pets, a pest control combining advanced technology [ Easy Installation and Use] Place ultrasonic mouse repeller 20-100cm from the ground, Just plug in our ultrasonic mouse repeller and it will do the rest. Usually you can see results in 3-4 weeks,