Noise to test speakers, to annoy people and animals, to keep teen kids away (as they are sensitive to some frequencies), same goes for animals. *Used to keep animals away at high frequencies *Used to test the range of headphones/speakers(just be on low volume) >>>I AM NOT RESPONSIBLE IF YOU MISUSE IT<<< Tested on me, my girlfriend, my dog, my neighbours, some of my friends Nobody was harmed in testing but definitely annoyed. Made In India