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We have regular contact with mobile phone jammer in the army, in order to prevent the phone bomb attacks, it is necessary.
Some shielded tool does not really shielded signal, and mobile phone jammer to be true, it produces interference by superimposing the signal waveform, thus significantly weakening the signal to disappear.
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.
Cell phone blocker to block the 3G 4G mobile phone signal similar, in the process of buying, we should note that we need to distinguish the type of signal blocking.
Knowledge: mobile phone jammer in some countries is within the exclusive tool, most people can not be used, is that legal constraints and security constraints. Only some institutions have the right to use.
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