Test signal jammer

As the number of days for the college entrance examination is decreasing every day, many schools have been busy recently, and they have been preparing materials and machines for the examination room. This allows candidates to take the exam in a stable and orderly environment. This is also the responsibility of the school. Therefore, recently we can see that a machine has been installed in the examination room. This is a test signal jammer that many schools have vigorously promoted recently. This can effectively counteract the problem of electronic signal cheating. It is effective, but it is unknown that its effect in actual use will also vary according to the installation location and situation.