Small, black firecracker-like devices that look like clover seed. They explode with a snapping sound. Doc Savage uses these to alert him to the presense of intruders while investigating a building.
| Identifier (URI) | Rank |
|---|---|
| dbkwik:resource/fh-2y0kbRPlzGScSOa2t5Q== | 5.88129e-14 |
![[RDF Data]](/fct/images/sw-rdf-blue.png)
