@Komnene Ah, yes, i can see them being useful for businesses, just not for the average home. Also, ir sensors sound like a better idea, probably much less eye-catching. 

 @66270c87 Most I've seen look the same as cameras but they're cheaper and simpler to operate so there's that 

 @66270c87 Maybe not exactly the same but similar at a glance, small boxes placed in the same corners of the room with one or two blinking lights