As the number of mobile users increases, mobile phones need to be disabled in certain places, including places of worship, lecture rooms, hospitals, concert halls, conference rooms, prisons, etc., and the ringtones of mobile phones can cause damage. Cell phone jammers are very effective in confidential conference rooms, where important information may leak from one room to the outside without anyone else knowing. The signal blocker can effectively break the communication between prisoners in the prison. The warden no longer needs to worry about prisoners on the phone. , So the appearance of the jammer solved this series of troubles.