Teachers in the school have the right to use Signal Jammer, so we can not use the phone when the class, this is too make people mad.
Cell phone blocker to block the 3G 4G mobile phone signal similar, in the process of buying, we should note that we need to distinguish the type of signal blocking.
GPS jammer just to have a car and have a cigarette lighter, it is very simple.
According to the British National Bureau of Statistics, the world every 10 electronic products, there are eight products from China. GPS jammer is also one of China's major export products.
Phone signal is not really the radiation, I think cell phone signal jammer can give you the answer, you try to know, huh.

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