Bird-X BirdXPeller Pro Electronic Bird Preventer Version 2, Sonic Bird Decoy Device, Perfect for Crows, Blackbirds, Grackles, Cormorants, and Ravens, Covers up to 1 Acre, 3-5 kHz FrequencyAuthor: Bird X Brand: Bird X Color: Green Features: Advanced Bird Decoy Device: Revolutionize bird control with the BirdXPeller PRO, an electronic bird decoy device that emits various naturally recorded bird distress sounds and predator calls to disorient, confuse, and frighten away birds from your space Humane Sonic Bird Preventer: Eliminate the need for harsh chemicals and traps with our reliable and humane sonic bird decoy that utilizes real sounds