i think it works o.k. at best. mine doesnt stay together anymore and it was used maybe 2 times. from my own observation when you cough much of the sound comes from your neck and throat area . some of the sound comes out your mouth but not all. the cough silencer cuts that noise down but not the other. i tried coughing into my shoulder with a heavy winter jacket on and felt it did the same thing if not better. some one is probably rich[>:]