Bird Chase Super Sonic features distress and predator bird sounds of over 22 types of birds. Provides a low-cost, long-term solution that targets pigeons, crows, starlings, swallows, gulls, woodpeckers, sparrows, grackles, cormorants, and many other birds. Protects property and up to 1 acre of surrounding area. Add optional pro pack attachments to cover up to 6 acres. Boasts easy installation, maintenance, and volume adjustment.