I can not admit that sometimes you have to use illegal means to prevent the use of some signals, similar to the invigilator in the examination room, this time we need to use a Cell Phone Blocker
Exam in the use of cell phone signal jammer is a very normal thing, it is not bound by law to use such a shielding signal.
Some taxi fleet operators to install their own cell phone signal jammer, designed to prevent the use of mobile phones while driving on the way to improve the safety index.
How to make a cell phone jammer? In China to buy a small module, so you have a test board, and can be assembled according to their needs a 4g jammer.
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