Got a call from a customer where I have an old 342 R Ademco panel still working its in mint condition and its an older couple and it does just what they need .
They kept hearing what sounded like the old Mini Howler entry / sounder going off in basement so I thought they had a problem with fire loop but when i got there the panel was ok took wire off for howler and still heard it.
Finally tracked it down to one of those exercise/ walk track machines they have in there basement it has a trouble sounder which sounds exactly like the old mini howlers did. Either way it was good they called me any way when I started to check fire loop found they had a roof leak and water was going into a smoke.