PocketHound

A super-sensitive detector that sniffs out cellphone use up to 75 feet away.

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PocketHound Courtesy Varitronics Systems

The PocketHound is the smallest, most powerful cellphone signal detector. From up to 75 feet away, it can reveal students cheating during exams, employees sending out corporate secrets during meetings, or prisoners using contraband phones in jails. And unlike its competitors, the PocketHound can detect 4G and European cell-signal bands. $499

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