Vintage Sound Guard Plug-In Sound Activated Switch Model S300 Carlon Thyrocon

This is a vintage Sound Guard Plug-In Sound Activated Switch, Model S300, made by Carlon Thyrocon, with adjustable sensitivity and timing; it is lighting control similar to the Clapper. It is new, still in the package, never opened. The instructions for use are inside. Please see all of the photos. As with all vintage electronics, use at your own risk.