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Bugs & Taps

This page shows the variety of different types of eavesdropping devices found or available in the US. 

Devices like this show why you need to rely on the company that has the understanding of the threat, knowledge of the devices and the technology, equipment, and experience to find them.


Miniature Microphones

wpeD.jpg (3773 bytes)These are mics we've found during surveys.  Tiny and hard to find.  Keep in mind, however,
that a microphone by itself is not an eavesdropping device.  It must be connected to
something:  a recorder, a radio transmitter, or even an amplifier for live listening. 
Even if the micropohone is carefully concealed, a thorough visual inspection
will reveal its wiring.

mic4.jpg (29081 bytes)
Microphones can use very small cables.  We have seen them use wiring
as small as #30AWG.  Each conductor in this size is about 0.01 inches in diameter. 

Electronic transformer wire can be used, too.  Typical diameter of this type
of wire is about 0.006 inches in diameter.



This microphone is an example of current technology.
It's shown about 2 times life size.  The only part of it that needs to be in the target
area is the small cylinder on the right side by the blue arrow.  It's less than 1/32" in diameter.  Imagine how many of these could be concealed in the nooks and crannies of a ceiling tile.



This is an example of a covert mic developed for field use and an intelligence agency.
Shown in an actual installation, hidden behind a molding on a baseboard in a conference
room, these can be extremely difficult to find.



 Radio Transmitters

roombug.jpg (6168 bytes) 

This transmitter is a little less than 3" long and 5/8" in diameter.  In the right concelament, it can transmit for several hundred yards.  With a 9 volt battery, it'll transmit all day.  With an external power source, it'll transmit for ever.


2.6Ghz.jpg (10005 bytes) This is a 2.5 GHz microwave transmitter.  It can transmit audio as well as video, so it
can be used as a room transmitter.  The audio signal is hidden by the video modulation
when a camera is connected.  If the bad guy is smart, he'll use video to confuse the TSCM technician.

  vox bug.jpg (9026 bytes)
This is a voice activated transmitter.  Called a VOX transmitter,
it monitors the sound in the room and transmits only when there
is conversation in the area.



This transmitter is called a GSM bug.  It uses cellular telephone technology.
It's a digital transmitter that can be remotely acitvated or sound activated
and can transmit room sounds to a receiving phone anywhere on the planet.



Telephone Taps

Series tap.jpg (6376 bytes) 

These photos show different types of series transmitters.
The top one is made  by a Japanese company and was commonly available
from "Spy Shops" here in the US.  Sold with a matching receivcer, US law
enforcement agencies documented the sale of several thousand units
during the 1990s.



Series tap1.jpg (5284 bytes)

The second photo is of a transmitter built into a plug-in phone adaptlor.
It was sold in kit form for "educational purposes ".  The kit came pre-assembled
and all the user had to do was snap the two halves of the shell together. 
Frequency is adjustable from 80-140 MHz.


 Digital Audio Recorders

Relatively new to the market, digital audio are quite a problem.  This one, made in Russia, measuring about 1 1/2" square and 1/8" thick can record hundreds of hours of audio.  Tiny and powered by an internal battery, these quick plant devices are very easy to conceal and the audio is superb.