This subject seems to come up a lot. Its certainly your home and you can do what you want, but these smokes are not designed to be connected to a monitored alarm panel, these relays were never designed to connect to a monitored alarm panel, and in many cases, making these connections is a violation of building fire codes, and always a violation of UL certification. Again, your house, you control it, but I just note this so someone less experienced reading this won't assume its perfectly OK just because others are doing it. And I've heard all the reasons, wife doesn't like double smokes, they are ugly, why should I need double, these smokes are cheaper, etc. This also explains why the relay, designed for circulation fans and automated fire doors, doesn't explain how to connect to a monitored panel.