The function and shielding efficiency of telephone signal jammer
Nowadays, people cannot do without mobile phones. People always put their hands on their phones all day long, but some places will block the phone signal. Next, greatjammer will tell you what the cell phone jammer is for and how to use it?
Telephone signal jammers are mainly used in places where the use of mobile phones is prohibited, such as examination rooms, schools, gas stations, churches, courts, libraries, conference centers (rooms), theaters, hospitals, government, finance,...