My wired alarm is 18 years old and still working strong, the maine thing that with a short life span is PIR'S, depending what make thay are. you should get your alarm serviced at less 1's a year? just to make shore it dosen't become a fire risk or fuilty.
Why can't you have a PIR pointing at a door contact? I have big window in my small hall way near my f/door.So can I put a door contact and a PIR in the same area to protect both? Also the auto message you do, how long have you got to record it? Is it as simlpeles to fit as it says on the box?