Or a thing to get triggered whenever there's a suspected burglar. Doesn't even need to get it right all the time, just can't get it wrong. Nobody ever suspects

Or a thing to get triggered whenever there's a suspected burglar. Doesn't even need to get it right all the time, just can't get it wrong. Nobody ever suspects the vacuum cleaner! Does anyone sell one that barks? Or makes it sound like 2-3 angry people are having a conversation about guns from different points of a room?