CHANEY C7015 Mysterious Sound Kit
The Mysterious Sound Kit remains silent for about 30 seconds after being "armed" (ample time to hide it in a room). After the 30 to 40 second time delay the tiny kit emits a strange high pitched sound for several seconds then a loud "ticking" sound. The loud ticking sound goes on all day unless someone finds where you have hidden it. Uses 3 transistors, a piezo speaker, and has a control to adjust the speed of the "ticking" sound. Operates on one 9V battery (not included). Size of PC board is 1.7" square. Complete with all parts, PC board and instructions. Skill level 1.