If I am in a meeting or meeting, I suddenly hear a strange sound! I cried and said, "Piriri, Piriri, Piriri." During a performance or concert, someone's smartphone suddenly rang and the air froze. The occasional accidents of cell phone jammer have now shattered. Many people think this is the reason for the "Please turn off your smartphone" announcement before the start. The radiation propagation form of road electromagnetic waves is based on the electromagnetic field law of the medium, and the interference energy released by the mobile phone jammer into the surrounding space is transmitted along the transmitter. Also, this may be the reason for the "radio jammer" installed in the theater. Mobile phones are very convenient because you can answer calls anytime, anywhere. A connection, even if you don't want it to not connect. With the popularization of mobile phones, cell phone jammers continue to develop, and they are called devices.