Unfortunately some of the more advanced bugs are designed to thwart the commercial bug detectors mostly by rapid frequency changes.
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These more advanced bugs can still be detected through infrared photography which can pick up the heat signature of a listening device especially if the wall s surface is first cooled with liquid nitrogen or even a fire extinguisher.
There are many types of listening devices available including hard wired radio frequency acoustic audio and optical bugs.
Our vario series of spy bugs can offer battery life of up to 200 days.
Perhaps the prolific listening device today gsm bugs operate in exactly the same way as a mobile phone.
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Wiretaps can be camouflaged in everyday items or they can use advanced technology with low power consumption.
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Here we examine some of the most frequently used listening devices in the corporate espionage arena.
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