Teachers in the school have the right to use Signal Jammer, so we can not use the phone when the class, this is too make people mad.
mobile phone jammer used in schools should be legalized because it can contribute to student learning and exam fairness.
Knowledge: the signal is actually encrypted transmission of electromagnetic waves, the signal peaks and troughs on behalf of 1,0. cell phone jammer play a superposition of waves, resulting in the shielding effect.
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
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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