For 4g cell phone jammer been installed in building like dormitory type, in order to make the cell phone shielding signal full cover room, we should try to install the cell phone signal jammer on the out side of the corridor if the installation condition allow:
Relative to install at out side, 4g cell phone jammer install at in side (i.e. the side with window and door), its strength of shielding signal transmit to room been decreased. Different wall thickness and materials affect the attenuation degree different.
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