How to stop the noise caused by mobile phones?

  • Nowadays, many places should be quiet places, but now because of the increasing power of mobile phones, many people can't control their loud speaking.
  • PerfectjammerPerfectjammer
    I am a student. I was supposed to study in the library, but I was quarreled by some people so that I couldn’t study. I was really very angry. Now I want to buy a portable jammer that blocks the signal of the mobile phone, so that I have a quiet Where you can learn.
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