Transparent film blocks radio signals

Cinemas, churches, and libraries should install this new transparent film which was developed in conjunction with the U.S. Department of Defense and ASTIC Signals Defenses, that blocks or seriously degrade radio signal penetration, making incessant talking and ringtones a thing of the past in such places. It can also be used by companies who want to secure their internal wireless communications from outsiders with malicious intentions. This transparent film utilizes a patented combination of metal and metal oxide layers, reducing the overall signal strength dramatically across the entire electromagnetic spectrum.