The old alarm system in our new house was dated — most security companies we contacted had never even heard of its manufacturer. But the fatal flaw was that its motion sensors were not “pet-friendly” and would therefore go off if the cats were to move about in our absence. Our insurance company gives us a significant discount for having an alarm system, so going without is not an option. So I ordered a completely new, modern system, some of the components of which you see here.
I will be installing these over the next few days. (Those of you who watch this space regularly and have noticed a lack of new posts — this is the reason; the install has kept me busy.)