Broadband Pro combines audible and ultrasonic repelling technology, Targets pest birds with an unrelenting combination of species-specific distress cries predators general harassments and newest-technology ultrasonic waves, Distress Cries repel Starlings Gulls Pigeons and more, 3 Predator Cries add terror and realism, 3 Harassments are an extra incentive to leave, Powerful ultrasonic sound waves round out the sound attack, Then customize by choosing volume silent time between sounds and hours of operation, Will cover up to 4 acres, SKU: BRX018