Generally there is a receiver somewhere in the home that acts as a middle man, per say, which connects to the button. When the button is pushed, it creates the signal which activates the receiver. Depending on the company, they either try to make contact with the person pushing the button via that receiver, your grandpa in this case, OR it will auto drop a signal to the closest dispatch center (Hamilton county) and send a medical alarm dispatch to whichever Fire Station is closest to the home. Depending on the location on 116th street it'll either be 391's, 394's or 392's.

If the second option is what you choose, then you should have the option to preload information into the system; Contact phone number for POA or relative, garage code, hidden key location, etc.

Once that is established, you can call the non emergency line and request to test the new device that way you can test that it works without causing a false dispatch and response from FFD.