Zn-401s Manual -

"The zn-401s," Alex began, "was a top-secret project developed by a team of engineers in the 1970s. It was meant to be a revolutionary audio processor, capable of manipulating sound waves in ways previously unimaginable."

Operates up to three separate components. zn-401s manual

To recap:

If the code is correct, the indicator light will turn off. If it stays on, re-enter the code or try a different one. "The zn-401s," Alex began, "was a top-secret project