As pictured, I believe It's a Yale EF-KIT2.
It was in the house when we moved here and we never got to grips with it so I've decommissioned it.
There is an array of sensors - door contacts, PiRs and the like, which I'll be removing so they can be had also. Also remote keypad and blippers.
It communicates wirelessly with everything, is mains powered with battery backup, and has a phone outlet so it can call out.
I have electronic copies of the manuals which I can share if anyone fancies a go at resurrecting it.
Yale burglar alarm (Woodhouse Eaves LE12)
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