problem is a phone only works if you have it on you. Grandma falling often is a case where she doesn’t have a phone (often grandma in this case is in mental decline and wouldn’t think to use the phone if she had it).
A privacy respecting device that can hear “help” and general cries/grunts to get help when needed is what the world really needs. This is much more complex than the ask, but it is the real need here. For me what the OP was asking is enough, I just need to inform a kid in a different room dinner is ready.








Because I have no idea if the questioner is going to do that beforehand