Mobile phone jammers with the ability to block signals are being used at test sites as a tool to prevent cheating. However, there is a sentence that "interfering equipment is harmful to humans." The Ministry of Education stated its position. This sentence lacks scientific basis. Mobile phone protection is an effective way to prevent cheating. According to the regulations of the Ministry of Education, we will announce how to teach you how to use the product. There are divergent opinions on this case. In response to this question, Signal Disruptor App Android interviewed where Chen is located, and there is a production and sales person with six years of experience. He said: "I touch this machine every day, no problem." Many movie theaters have introduced this kind of equipment. I installed and used it. There is no unpleasant situation to the human body in these areas. We will study it as one of the important issues related to electromagnetic waves in the future. There are many kinds of "electromagnetic waves". As long as you use a mobile phone jammer, you will definitely be affected by electromagnetic waves. There is a theory that the commonly used electrical appliances will not affect the human body because they only emit a very small amount of electromagnetic waves. High-intensity microwaves generate heat in the same way as microwave ovens, which can affect living organisms. In Europe and America, the legislation of human body electromagnetic wave protection standards and the standardization of electromagnetic wave measurement methods are steadily advancing. Signal Jammer