Cameras, video monitors, amplifiers, electronic switchers for audio and video signals, multiplexers, digital video recorders, optical lenses; fire safety equipment, namely, alarm bells, smoke detectors, carbon monoxide detectors; smoke detectors, carbon monoxide detectors, transformers, batteries; electronic locks, namely, magnetic locks; pan-tilt scanners, electronic scanner controllers, emergency signal transmitters, namely, emergency buttons; electric contacts, namely, magnetic contacts; G...