With this ultrasonic generator, one produces siren-like pulsating, aggressive ultrasonic tones that are perceived as extremely unpleasant by many animals. For this reason, rodents, insects, crawling parasites, wildlife, birds, and more avoid the area secured by the ultrasonic generator. For optimal effect, the generator features an adjustable frequency range of 8 to 40 kHz, with a special speaker equipped with a curved aluminum dome membrane to ensure optimal sound distribution.