In this era of highly open information, the application of wireless communication technology has become ubiquitous, bringing great convenience to our work and life. But at the same time, the leakage of radio waves and the risk of being eavesdropped is also increasingly prominent. Once the wireless signal is maliciously listened to and interfered with, it will bring serious threat to personal privacy, business secrets and even national security. Therefore, it is particularly important to construct a solid communication line of defense to isolate external insecurity.
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Communication shielding using the physical principle of electromagnetic jammer, can be formed within a specific range of radio “static area”, cut off all radio frequency signals in and out, from the root to eliminate the risk of communication leaks and eavesdropping. It builds an invisible but impenetrable electromagnetic barrier for sensitive places, so that wireless signals are completely “confined” outside.

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In addition, for some highly confidential scientific research laboratories, military bases and other special places, communication shielding is also an indispensable and important protection tool. It not only prevents the leakage of wireless signals, but also effectively block the interference of external radio waves, for these high-risk areas to create an absolutely safe and controllable private space.
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http://thejammerblocker.hupont.hu/6/physical-isolation-shielding-for-sensitive-places
https://slownet.ne.jp/blog/view/212231