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.
I'm curious how much can the Jammer shielding in the end range, is not there can be 1 km away, it would be too crazy
Cell phone jammer is mainly equipment requires shielded 2G 3G 4G signal, it acts as a technical means, which has been present in the current society, many people use such devices.
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Cell phone signal blocker is illegal, but in some cases, such as the examination room, the battlefield, special needs, using mobile phone blocker can be a good solution to the prevailing situation.
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