Nowadays society, mobile phone is our daily essential items, almost manpower a mobile phone gives us a lot of convenience, but sometimes also cause a lot of inconvenience, which occasions need to avoid mobile phones, need to use cell phone signal jammer?First: schools, major examination centres need signal blockersSchool is a place to study, students addicted to mobile phones and classroom "small actions" greatly affects the academic, many schools will take to confiscate the mobile phone handed over to the way of mandatory educa...
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