Over the years, as long as there are large-scale exams, in order to completely eliminate the phenomenon of fraud on the test site, it has become very common to install wifi jammer. However, many people have only heard of this thing and have not carefully observed what it looks like.
The construction of a Wifi jammer?
A wifi signal jammer is first of all the material of the casing. There are currently two types on the market. One uses a metal case and the other uses a plastic case. The metal shell is generally used by the external test room wifi jammer device, while the plastic shell is generally used by the built-in test room wifi frequency jammer. There is still a little difference in the internal structure of these two types of test room signal jammers.
The wifi blockers with a built-in antenna generally installs the antenna inside and is composed of various electronic components. The built-in antenna signal jammer like this is mainly a little more beautiful in appearance. The external antenna wifi signal blocker has several interfaces on the shell for installing the external antenna. These connectors represent signal shielding for different channels. Generally, the number of external antennas also determines the pros and cons of signal jammers in the examination room. 
The shielding range of the antenna will be wider. There are also various electronic components inside. Through these electronic components, the purpose of interfering signals is achieved. Although many manufacturers produce signal jammers for examination rooms, there are very few companies that are authoritative in this regard. Among the more professional domestic companies, Jammer mart is one of the best. They have been engaged in design and research in this area for many years and have a number of technologically advanced products. More in line with the requirements of the majority of schools.