In recent years, signal jammers have frequently appeared in school classrooms, churches, meeting rooms, secret units and other places, and have become one of the indispensable equipment. The essence of the signal jammer is to interfere with the wireless signal of the communication equipment, so that the mobile phone can not access the Internet, can not receive signals from the base station, and can not send signals out through the network to achieve the effect of network disconnection. Nowadays, almost everyone knows about shielding equipment, and basically everyone who has taken the exam should know about it. Generally, you will find its trace when you enter the examination room before and after the classroom. It is not just a simple matter of shielding mobile phone signals, but also a fair competition environment for candidates. The installation of signal jammers may result in no network signals in a region, but it will not affect the transmission of base station signals at all.

Examination is a way to test the level of knowledge. Through the examination, students' learning conditions and other abilities can be reflected, so as to ensure the fairness of the examination results. The examination room has strong discipline, and is equipped with a series of anti cheating equipment, such as the chief examiner, invigilator, etc., to supervise the complicated process of the examination. Fundamentally block the source of signals to prevent cheating. The use of shielding equipment should be treated rationally. The signal jammer sends interference signals of the specified frequency band to interfere with mobile signals received by mobile phones. In this way, mobile phones cannot connect to the network, so as to completely ensure the order of the examination room and eliminate mobile phone cheating.