Mobile phone jammer is increasingly used in qualification exams
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AdairIsaac August 2019More and more qualification tests are now starting to block cell phone signals. Even high school exams now use them. So is this device really effective in preventing cheating?
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Perfectjammer
August 2019
There is no doubt that cell phone jammer stop cheating. China, Japan, France and other countries already use the devices in major exams. The main purpose of this device is to cover the normal signal source by transmitting signal wave, so as to achieve the purpose of shielding the surrounding signal
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