Related Clues:

• "Cigarettes are dangerous," e.g.?
• Ask Rommel, nervously, about a warning device
• Viewer in a door
• Voyeur's vantage point
• Look here!
• Safety device for every home (2 words)
• Way to see through a front door
• Device warning of fire
• Fire announcer (2 words)
• Kaleidoscope opening