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.
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.
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 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.
The car was installed to prevent the GPS signal tracking is very important, especially for the banking system. Sometimes the need to use GPS jammer