Ultrasonic Pest Repeller: The ultrasonic waves can stimulate the brain and auditory nervous system of pest to keep your home safe from all kinds of pests. Multiple-object applications: The mouse repellent can be applied to repelling mice, roaches, spiders, insects, mosquitoes, bugs, and ants. You can have only this ultrasonic mice repellent for many harmful animals without a few other traditional mouse repellers. Wide coverage: The ultrasonic pest repellent can cover up to 900 sq. ft. We recommend one unit of pest control device per room to get the optimal result because the ultrasonic wave would be influenced by walls or solid objects. Less power consumption: keep you away from cleaning up dead pests, odor and corpses of pest, no batteries, saving a lot of money. Quiet and effective: Ultrasonic pest repellers work with low frequency ultrasonic waves, which are difficult for humans to hear. But it is very effective for rodents and pests, ultrasonic waves let them leave your home quickly