Sorry I tried searching forum, I still got holes in my sheet rock, so wiring up several for yet to be gotten alarm system is the project.
Models?
Thanks in advance.
Don't bother with pir's go with dual tech sensors they are more stable and accurate. CK or Pyronix are good brands bosch are big and ugly, the best external devices are Redwall but they will cost you a lot, unfortunately for people living in the US you are years behind the UK for small reliable detection devices.