Ключевые слова: access, alarm, alert, cctv, code, contour, control, danger, digital, entry, explosion, fire, flat, glowing, guard, handbell, home, icon, illustration, isolated, key, keypad, light, line, linear, looking, message, neon, notification, outline, privacy, private, protection, ring, ringing, safety, security, set, sign, sound, surveillance, symbol, system, technology, video, watching, weapon,