The Bird Chase Super Sonic™ is an innovative outdoor sound device designed to effectively deter pest birds from large open spaces. This programmable system features audible bird distress calls and predator calls from over 24 species, broadcasting them for approximately two minutes every ten minutes to alert birds of danger. With a base unit covering 1 acre and the option to add additional speakers for up to 5 acres of coverage, it is ideal for preventive bird control and suitable for light to medium bird problems. Weatherproof design For light to medium bird problems Built-in speaker covers up to one acre Each additional speaker covers one additional acre Additional Speakers are set at Max Volume (non-adjustable) Nesting birds may require additional bird deterrents or methods