Aiming at the uplink and downlink channels of mobile phone system, it uses frequency doubling, frequency division, frequency hopping filtering and other technologies to analyze the required shielding frequency; A spherical shielding space is customized according to the power of the shield, and a shielding magnetic field is automatically formed within the specified range to disable the mobile phones (including PHS PHS GSM China Unicom, China Mobile and CDMA China Telecom) in this space. When the shield is in the working state, it can disable the function of sending and receiving signals of mobile phones within the specified range, and can not dial out and dial in, so as to achieve the purpose of mandatory prohibition.
Mobile phone signal jammer can be used in various examination rooms, conference rooms, gas stations, oil depots, churches, hospitals, courts, military places, libraries, cinemas and other places.
However, in densely populated areas such as schools, it is prohibited to set up radio stations with excessive electromagnetic radiation, and mobile phone signal shields shall not be used without authorization.