Can cell phone jammers really prevent exam accidents?

Now many schools are busy preparing for the examination room. This is because the most important exam of the year, the college entrance examination is coming soon. Facing this most important exam, many schools are actively preparing what is needed in the exam room, ensuring the normal order of the exam room and meeting the basic needs of the exam room. As a means of signal cheating, I even purchased an exam signal blocker as a countermeasure, but its effective range is limited, so a new question arises, is it still effective after passing through the wall?

There are a lot of exams now, no matter whether it is an exam organized by the school itself. It is still a big exam in the society. These are inseparable from the signal shielding device for fairness, so the quality of the signal shielding device determines the fairness of an exam. Therefore, it is necessary to choose a signal shielding device for the fairness of the test. In China, I learned that there are indeed many manufacturers of signal jammer, and there are many types of jammers. Before purchasing, the user should clarify his own needs to prevent the examination room accident due to poor shielding effect, and he is still paying attention to the correct use method. sex.

First of all, I want to clearly use the place, most schools use the test room-type mobile cell phone jammer, which is suitable for long-term work and good quality. The second is how big are we in the shielded area? For example, a room of 100 square meters is still a venue of 1,000 square meters, etc. If the area is large, the power must be larger, and if the area is small, the shielding power can be adjusted. Then there are the frequency bands that need to be blocked. Are all of China Mobile, China Unicom, Telecom, and CDMA blocked? Still only need to block some frequency bands.