Part of my "What I learned with no power for 40 hours" post on another board:
When the battery back up for the alarm dies (approx 14 hours), the alarm will chirp every 10 seconds for at least 3 hours. At this time, you can start pulling wires to make it stop and it will. When the power comes back on, you will realize you apparently pulled the wrong wires as it starts chirping AGAIN and you're forced to yank the whole damn thing from the electrical system.
I also found out a year or so ago that if something big falls on the floor, like, say a mirror, it will set the glass breakage alarm off and the police will check your house out for you
