Ключевые слова: above, alarm, alertness, background, camera, cctv, circuit, control, detector, device, digital, electronic, equipment, floor, footage, guard, handrail, home, indoors, inspect, interior, metal, monitoring, observe, office, prevention, privacy, property, protection, railing, record, room, safe, safety, security, staircase, stairs, steps, stone, supervision, surveillance, system, technology, television, video, view, vision, wall, warning, watch,