How many test room jammers should be installed in a classroom? Every year when the college entrance examination is coming, before this important day, the staff in charge of the college entrance examination room are actively preparing for all kinds of materials needed by the examination room. A machine device called the examination room jammer is also set here. This machine can ensure the order of the examination room, maintain a good environment and effectively isolate all communication signals in the examination room. Electronic signal is an increasing information transmission tool today. If you want to isolate the signal, you need a mobile phone jammer. However, facing the problem of installing jammers, many schools are thinking about how many machines should be equipped in a classroom?