Artifact Details
![A pipe separated in the middle to reveal a small radio receiver concealed inside](/static/b63c89027536fe821f18eb33f68206f0/c0173/RadioReceiverConcealment.jpg)
The radio used bone conduction, allowing the user to inconspicuously listen to a signal by biting down on the pipe.
A subminiature radio receiver is concealed in this modified pipe. The user hears the sound via “bone conduction” from the jaw to the ear canal.