As living standards improve, health issues become more important. In daily life, with the propagation and diversification of radio waves such as smartphones, mobile phones, wireless local area networks, wireless and IC tags, we worry that radio waves may be harmful to our bodies or the safety of radio waves Questioning sex. Signal interception equipment such as jammers are widely used in many places. The most common is to prevent candidates from cheating at the test site.
In fact, it applies not only to college entrance exams, but also to qualification exams, high school entrance exams, national exams, etc. This means that cheating using mobile phones has been discovered. I think this is the most effective way to use a cell phone jammer and temporarily "out of range" test center. In some places, the use of such equipment is prohibited, so make a good choice before installing and buying.
The signal jammer transmits weak radio waves with the same frequency as the radio waves of broadcasting information from the mobile base station, communication is blocked, and the device will be installed in some places where the use of mobile phones is prohibited. We have started taking steps to restrict the use of mobile phones in ATM corners. This is a joint effort by financial institutions to prevent criminal damage such as wire transfer fraud.