Rat Repellant Machine
Electronic Rat or Rodent Control System is a high technology electronic device like transmitter which emits high frequency sound called ultrasonic sound.
Ultrasonic sound waves have frequency above 20 KHz which is the upper limit of the hearing range of the human ear.
The powerful ultrasonic sound waves hit the eardrums of rats.
As the rats do not have the ability to close their ear, they have to listen to the sound waves, causing pain, fear and anxiety and enabling them to leave the place.