How it works: The sounds generated by the device in the ultrasonic range (13KHz-60KHz) are perceived as unpleasant by animals in the detection area and ensure that the animal moves away from this area. The sounds are harmless to humans and animals.RANGE: The animal fright has a motion detector with a detection range of 120 and a range of 5-8m. This corresponds to an area of approx. 40 m. If you want to protect larger areas, simply order several devices. The sensitivity of the motion detector is infinitely adjustable.TWO FREQUENCY MODES: The animal defense device can be set to two different frequency ranges. Since different animals have different hearing, the frequency range can be adjusted. The frequencies can be adjusted slightly using a continuously variable control knob. This ensures that the device works optimally. In the first mode (20-50kHz), the ultrasonic waves are no longer audible to humans.