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Tradecraft Artifacts
Technical devices
Contact microphone
This tool was used to hear conversations in an adjacent room when no microphones were in place. The device was held against the wall and sounds were transmitted to a headset that had volume and squelch control. It was only effective through hollow walls and when there were no other sounds (TV/radio/water pipes etc.) that would interfere.
The contact microphone was used to listen to conversations in an adjacent room.
