The Transonic Pro is safe, indoor pest control! This best selling electronic repeller couldn't be simpler just plug in the device to repel rodents, bats, spiders and more. Combines both sonic (audible) and ultrasonic (silent to most humans) sound waves to drive pests away with sounds they can't stand. With a range of up to 3500 sq-ft, the Transonic PRO from Bird-X is a low-profile electronic pest repeller that uses two side-by-side speakers to transmit both sonic (audible) and ultrasonic (nearly silent to humans) sound waves that humanely, safely repel pests. No chemicals, no traps just plug in the device to disrupt the communication, feeding habits and habitats of rodents, bats, spiders and more. Transonic PRO is a simple, discreet, cost-effective solution to your indoor pest problem.