Audio equipment, namely, speakers, amplifiers, microphones, graphic equalizers, CD players, and tape decks, electrical and electronic apparatus for use in connection with public address systems, namely, sensing, measuring, monitoring, and data recording equipment, namely, cabling, fiber, fiber optic rings, distributors, cluster distributors, data gathering and distribution nodes; electronic systems comprised of micro processors, digital signal processors, codecs and touch screen monitors for processing input, output, display and communication of data and signals, analog to digital converters and digital to analog converters, radio transmitters and radio receivers; computer hardware, computer software for controlling public address systems, voice alarm routing, digital audio transmissions, networking, phased evacuation of premises and interface with fire, security, building, and energy management systems; video display units; safety, emergency and fire alarms; parts and fittings for all the aforesaid goods