Camcorders; Acoustic alarms; Alarm bells, electric; Alarm installations and alarms; Burglar alarms; Electric buzzers; Electric door bells; Electron capture detectors; Electronic access control systems for interlocking doors; Fire alarms; Locks, electric; Magnifying peepholes for doors; Smoke detectors; Surveying instruments; Theft alarms; Warning bells; Closed circuit TV systems for security and surveillance, namely, cameras, switchers, monitors, microphones, and recorders; Electronic video s...