Abstract: A guitar neck is formed with a protruding trapezoidal heel which extends into a pocket formed at the neck end of the body. Motion of the heel within the pocket is limited by the sides of the pocket, and by a lip which protrudes from the pocket floor to engage with the neck upwardly of the neck heel.

Abstract: A fully hand portable security system includes a plurality of radio transmitter equipped detectors with batteries, configured to generate one or more radio signals indicating the sensing of a potentially hazardous environmental condition by the detector and a central controller including a weather resistant housing including a radio receiver, a processor and power supply circuitry, operator audible and visible alerting devices and connectors activating or deactivating various optional or other devices at the location and transmitting alarm or other trouble warning message to remote location. The controller is configured to be powered by either AC or DC power supply, including an external, hand portable battery providing a multiday power supply for operating the system for at least one week. Operation of the system is as simple as carrying the components to the area to be protected, hand install the detectors about the area, connecting the controller to the selected power supply and turning the controller on.