Ключевые слова: air alarm, alarm, background, big, blue, brother, building, camera, cameras, cctv, circuit, city, control, crime, danger, electronic, equipment, guard, home, industry, isolated, lens, life, loudspeaker, modern, monitor, monitoring, multiangle, observe, outdoor, privacy, private, property, protect, protection, record, safe, safety, secrecy, secure, security, sky, spy, street, surveillance, system, technology, television, urban, video, view, watch,