History
After being defeated by the Fantastic Four, Doctor Doom decided to try to ally with Spider-Man against them.[1] To find Spider-Man, Doom intended to build a specific machine that broadcast impulses only Spider-Man would hear.[1][2] Doom deduced that Spider-Man had spider-related sensory powers, thus a transmitter using the same wavelength of a living spider kept within a spherical fishbowl.[1]
The transmitter sent only audio messages within a five-mile range,[1] and only spiders and spider-related individuals could hear those.[2] Those people, however, could track the impulse to its point of origin.[1][2]
Doom built and used this device from a hidden laboratory somewhere in New York City,[1][2] where he met with Spider-Man. Understanding that the interview may not be successful, Doom sent a robot doppelganger of himself to talk with Spider-Man while Doom himself remained hidden behind the curtains.[1]
Doom destroyed the laboratory, apparently along with this item, soon after the meeting.[1]