http://www.articleheaven.net en-us editorial@articlealley.com This technology takes outdoor sound and broadcast a comparable influx seems to cancel out external sound. It turns out the sound so you can listen through headphones seem not have any disorder. A very good example of how these headphones can be used is th... http://www.articleheaven.net/this-technology-takes-outdoor-sound-2104956.html 10th March 2011