Aosion ultrasonic sound pest repellant (AN-B019) Paten NO.: ZL201130006604.4 Work PrincipleAdopting the most advanced pest control technology, not only repel various of pests, but also can make it as a air purifier, it will control roaches, ants, spiders, mice, rats, crickets, silverfish, earwigs, scorpions, fleas, ticks, bats etc. ..