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Want to detect GPS devices and cell phones all around you? We have already covered plenty of awesome tools for that. This Cell Phone and GPS Detector is a law-enforcement grade device that detects the presence of concealed cell phone devices. This is especially useful if you don’t want those smartphones with video cameras around. The device vibrates when it detects a mobile phone being used nearby – up to 40 feet away. The device has an audible alert mode you can listen to with an earphone. The volume increases as you get closer to the cell phone. Sets you back $295.
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