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Sonic programmable species-specific bird repeller uses birds' own distress calls to create a "danger zone." Choose any of the 8 programmable bird sounds including predators to help scare all the birds. Choose volume, direction, hours of operation and mute time between sounds. Covers up to 1 acre. Ideal for use in a front or back yard, on a rooftop, or in a small parking lot, field, building or anywhere else. Effective against crows, blackbirds, grackles, ravens and cormorants.