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Description
This device bounces a beam
of laser light off a rigid object, and detects the sounds made near
that object by analyzing the changes in the reflected beam. The
harder the object, the more readily it conducts sound, and the
closer it is to a given conversation, the better the sound quality
(a glass window pane or a metal hatch are perfect, concrete or brick
walls less so, and insulated walls are very poor). The target object
(but not necessarily the conversation to be monitored) must be
within direct line of sight.
The device is about the
size of a bulk 1 pistol, and can be connected by a cable to a hand
computer or other data-recording device. A pair of headphones or a
data headset can also be attached to the device for real-time
monitoring of conversations.
Focusing the microphone an Average:
Electronics task at short range.
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