The powerful sound waves generated by the transducers of the repellers are within the hearing range of many pests, and cause them pain and discomfort. Sometimes, the pests will leave the area being protected immediately, and at other times it will take as long as four to six weeks before there is a significant reduction in infestation.
The transducers are quiet. If you cannot hear them, do not think that the unit is not working. You cannot hear ultrasound. It takes three to six weeks for the system to have it's desired effect on the Rodents.
The Ultrasound emitted by the machine becomes unbearable to the rodents and they try to run away. Rodents get irritated and look out for quiet safer areas. As a result of the continuous sound pressure emitted by the machines some rodents become violent hence there should be an opening like a door or a window to escape.
Post commissioning of the system sometimes shows increased rodent activities, what we say as the regular Post Commissioning Syndrome. The agitated rodents unable to bear the sound waves are disoriented and vent out their discomfort until they are flushed out or find an escape route.
Rodents stop entering the areas being protected by us, because the ultrasonic sound waves hit their eardrums and cause them considerable pain and discomfort. They do not get immune since the sound output is at varying frequencies. They do not die unless they get trapped in a particular place for days together or are under consistent exposure to ultrasonic sound.