Products such as radio barriers are controversial. Current college entrance exams and regular practice exams use signal jammers to monitor quiet examination rooms and other locations to ensure fairness and impartiality. I have something to say about how to choose a signal barrier. Before you buy, you need to know the signal you want to block. The factory can adjust the cutoff signal at the time of shipment.

You also need to consider where it applies. The communication suppression device applied in indoor places is also applied in places such as inspection rooms, conference rooms and offices. Jamming devices applied outdoors must use jamming power. Achieve an appropriate blocking distance. Choosing the appearance of WiFi block is important. Separate the external antenna and the built-in antenna. The external antenna occupies a large volume. It has the effect of stability.

Some people consider the power supply size. It divides things such as low power consumption, medium power and high power. Generally, it is recommended to use a high power jammer. The blocking range is wide. The blocking range is also an important point. Power is related to the cutoff range. Use a low power jammer at the test site. High power cell phone jammer can reach 300-400m.