Mobile phone signal jammers are mainly aimed at all kinds of places where the use of mobile phones is prohibited, such as various examination rooms, schools, gas stations, churches, courts, libraries, conference centers (rooms), theaters, hospitals, governments, finance, prisons, public security, and military centers. It is understood that the mobile phone signal jammer on the market can limit the mobile phone signal within 500M meters from the launching station. The shielding radius is…

In today's technological society, people's lives seem to be inseparable from GPS, and our smart phones have GPS functions, including GPS positioning and GPS navigation. Our car also has a GPS system to make it easy for our car to be stolen. At present, the smart phone watch of children in the market is equipped with GPS function, and many parents know the safety of their children in order to facilitate the management of their children. There are many examples of GPS functions in life, not…