Lentek Ultrasonic Pest Control 500Sq.Ft.- PR30 - Ultrasonic Pest Repellent An Electronic Pest Control Product - 3 Pack $14.30 "Lentek" brand Ultrasonic devices use ultra-high frequency sound waves that are set within the hearing range of rodents and other common household pests. Inaudible to humans, cats, dogs and most other household pets, the Ultrasonic frequency sounds like an extremely loud siren to rodents, driving them from the protected area. The Lentek PestContro 500 is designed to provide ultrasonic coverage wit...