Why is the black technology test room signal jammer so powerful?

Last month, cheating occurred in the college entrance examination in Shandong, China. Some criminals confused the candidates and said that they could provide cheating tools to help candidates pass the exam smoothly. But in the end it was discovered, and because of this, the prospects of these candidates changed. So, in such a large-scale examination, how to prevent fraud? According to my understanding, what is called a signal jammer is used in these years. Why is the black technology test room signal jammer so powerful?

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The test room signal jammer is mainly used to shield the signals of various frequency bands of mobile phones. Usually, fraudsters need to send the information of the test papers through the mobile phone, or they need to send the answers back through the mobile phone. Therefore, blocking the cell phone signal is the best way. Now, many people want to opportunistically pass the exam through such means. However, this method is unfair to other students who study hard. Therefore, it is more important for schools to install signal jammers in the examination room. Among the many signal jammer manufacturers, which one is better? There is a company specializing in signal jammers in Beijing, named Shenzhou Mingda. Compared with the products of other companies, their biggest advantage is that they have a larger choice. Currently, their company has two types of signal jammers with internal antennas and external antennas. At the same time, it also provides program services, which can save the school from worries. The reason why the test room signal jammer is so powerful is because of its own black technology, which uses the method of blocking the signal to shield the mobile phone signals near the test room. In this way, it achieves the purpose of making the test fair and just.