According to Bird-X, research shows that animals' brains respond to pain and terror by embedding the circumstances (sounds, sights and sensations) of an original terror situation, setting off a fresh wholesale "terror" response when they encounter similar circumstances. In one study, shot pellets were found in the breast muscles of 40% of the adult geese sampled, Bird-X reports. These geese have therefore felt the pain and heard the sounds associated with gunshots. When they reencounter that sound they will leave in panic, and their flockmates will follow.
GooseBuster includes a control unit, four directional speakers with 100' cords and a 24-hour timer, and covers up to 7 acres (21 acres with just two units). AC and DC models available immediately.