The shielding technology system adds a metal shielding layer outside the ordinary unshielded wiring system. The shielding is to isolate the metal between two space areas to control the induction and radiation of electric field, magnetic field and electromagnetic wave from one area to another.
　　Mobile phone hardware shields are mainly used to release radio interference waves. They can disable mobile phones within a specified range and automatically form a shield. At present, it is mainly used for banned mobile phones in flammable and explosive places, professional silent places, ordinary silent places, microwave interference prevention places, confidential places, operating places, etc.
　　When the mobile phone hardware shield is in working condition, the interference distance according to its power specification will generally result in complete failure of the mobile phone and the telecommunications base station system within a range of several meters to several tens of radii. The user who dials the above mobile phone will receive the message “The user is temporarily out of service area”. Under certain circumstances, the mobile phone shield still has a lot of help for people.