But it isn't simple? Look at that circuit board for gods sake, that's probably 6+ layers and apparently required custom gaskets around crucial components. If y

But it isn't simple? Look at that circuit board for gods sake, that's probably 6+ layers and apparently required custom gaskets around crucial components. If you consider the device as a whole, it is not simple at all. That's kind of the crucial point, too. A smoke alarm can only be considered simple when everything on the path from smoke detector to alarm is simple, and that's not the case here. Which makes this seem like a case of not getting the basics right.