Listening Devices - The Punisher Armory No. 1, July, 1990, Page 4

Listening Devices - The Punisher Armory No. 1, July, 1990, Page 4
From the Punisher Armory No. 1 Page 4:
That little blob of crud on the lithium battery is one of my favorites. A microcircuit that is out of its DIP package is glued to one of the battery contacts. The antenna just hangs outside. These can fit anywhere, I like to drop 'em beside a floor baseboard. most people don't even know what it is so they keep it!
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