"Really phones brought us lots of conveniences, but still some naughty students use it in appropriate time. Usually they make secret phone calls, send messages or play games during classes which directly influence teachers' lessons going and students' study. Thus, it will deduce the healthy growth of students' body and mind. You know excessive using of cell phones will do harmful their eyes and shoulder joint, etc.
Facing with the no stopping dins of cell phones, some experts have suggested the legal use of cell phone jammers for teachers in school time. Cell phone jammer is specially designed for disabling the normal transmission of signals between mobile phone and the nearby base station. It is a so powerful device that can cut off all kinds of cell phone signals, such as to jammer 3G 4G GSM CDMA DCS PHS PCS, etc."
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