Someone told me that he needed to block some of the signal, I recommend this site (Mobile Jammer) to him, and I hope to help him
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Some shielded tool does not really shielded signal, and mobile phone jammer to be true, it produces interference by superimposing the signal waveform, thus significantly weakening the signal to disappear.
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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