I have read through quite a few posts on this forum. One recurring request I have seen is some way to hear the base station voice prompts, etc., in other locations throughout a home.
I have seen several references to using a baby monitor, people asking if a second base station could be tied in, etc.
It seems an easy solution would be to either make the extra sirens able to relay the voice prompts, or to create a standalone speaker that would do so.
I will buy two when you make them.
Mike