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.
Why can not we use the cell phone signal jammer in public places, such as public transport vehicles. Is it illegal to do?
Cell phone jammer in the use of very simple, only need to install the corresponding antenna, turn on the switch can shield mobile phone signals corresponding to it.
I can not say that some parts of the hotel is equipped with hidden surveillance cameras, peeping my privacy, so sometimes Wifi Jammer is quite useless
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.