This handy mobile bug or cell phone detector, pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cellphone from a distance of one and-a-half metres. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is a...By: yhdesai
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from Instructables: exploring - technology - robots http://ift.tt/1zYBO3E
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