Intelligent Technology: This ultrasonic mouse repellent emits ultrasonic waves of different frequencies (25kHz-65kHz) to stimulate the nervous system of insects and mice, making them feel uncomfortable and gradually fleeing. Intermittent changes in ultrasonic frequencies prevent them from developing immunity and adaptation. Large Coverage Area: Each ultrasonic insect repellent can cover up to 120 square meters. It is recommended to install the hammer vertically 20-80cm above the ground. For best results, equip each room with an insect repellent. Safe and environmentally friendly mosquito control: non-toxic, chemical-free, radiation-free, low power consumption, noise-free, 100% safe for humans and pets, you will say goodbye to mouse traps, mosquitoes, mouse pads, harmful poisons, insecticides and more, no batteries will save you a lot of money and give you a 100% safe and environmentally friendly home. Super quiet and effective mosquito repellent: The ultrasonic mosquito repellent uses