Noise Cancellation?

http://www.huffingtonpost.com/2013/10/29/noise-canceling-window-treatment-video_n_4171667.html?ncid=edlinkusaolp00000009

I confess to being both intrigued and doubtful about this device.  Does it really work?  It also brings up the question of how many one would have to purchase for a standalone house.