In India, there are a lot of people use the cell phone signal jammer for exam tools, they are still students for cheating. Can effectively prevent students from cheating.
I'm curious how much can the Jammer shielding in the end range, is not there can be 1 km away, it would be too crazy
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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.
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