"Mortimer" wrote in message
om...
I wish to install a basic alarm system to protect kitchen back door,
dining room patio doors (both at rear) and front door/hallway
downstairs and just landing upstairs which should be enough for attack
via any bedroom. Only thing is we have two cats 15 and 17 years
old,not overly active but still walk about and have access to all the
house. What sort of alarm system should I go for, PIRs seem simple to
source and install but are there any that ignore cats and only react
to humans?

A dual-tech microwave/infra-red detector that goes by weight immunity is the
best for animals that are prone to jump about on furniture and things.
Pyronix, along with many other makers, have a range of these designs. The
Pyronix are marked with a product number which ends with PI.