The frequency jammer mainly shields the signal based on the analysis of signal communication principles, targeting various frequency bands of wireless signals. At present, frequency jammers scan channels from low-end frequencies to high-end frequencies at a certain rate during operation. This method causes the signal received by the mobile phone to become a pile of garbled code through interference, making it unable to receive normal data signals from nearby base stations, and naturally unable to communicate with the base station. At this time, the mobile phone will appear in a state of no signal, no network, no service, and so on.

The main function of the frequency jammer is to shield the Mobile phone signal signal so that the mobile phone can not operate normally. For places such as exam halls, prisons, gas stations, etc. that do not require mobile phones, they are essential equipment. It is very convenient to use during exams, as it only needs to be placed on the podium to interfere with the signals in the exam room, and it will not affect students' exams when used in work. In addition, there is no need to worry that it will affect 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 Mobile phone signal signals. So far, with the development of technology, this frequency jammer has become increasingly excellent in performance and can cover a wider range, making it one of the important equipment for shielding signals.