With the popularity of mobile phones, its arrival brings convenience to people's daily life, and it is inevitable that some people will maliciously use mobile phones to engage in some bad behaviors. For example, in the past, cheating in exams was mainly done by typing notes and carrying notes into the examination room, but now it is done by using mobile phones. Nowadays, the participation of some signal shielding devices is indispensable in the examination. The use of these devices has solved many problems of cheating and disturbing the order in the examination room, so that examinees can take the examination in a fair environment. Therefore, it is necessary to use frequency jammer in some aspects.

The main function of the frequency jammer is to shield the mobile phone signal so that the mobile phone can not operate normally. It is an essential equipment for examination rooms, prisons, gas stations and other places that do not need mobile phones. It is very convenient to use in the examination. It can interfere with the signals in the examination room only on the platform, and the use of frequency jammer in the work will not affect the students' examination. In addition, there is no need to worry about the frequency interference opportunity affecting the use of other electronic devices. It is mainly used to cut off the connection between the mobile phone and the base station, so as to shield the mobile phone signal. At the same time, with the development of science and technology, the performance of this kind of shielding jamming machine and equipment is getting better and better, and the coverage is getting wider and wider. It is an important equipment for shielding signals.