When I lived in a city flat I used to have a sinking feeling every time i came home as I got to the top of the stairs and expected to see the door ajar. Silly I know. Our car was broken into twice, because in those days stealing car stereos was a thing.

Anyway, when we got a house we also brought a diy alarm connected to the land line. It was liberating to know you weren't going to come home to any nasty surprises.

I looked into how they work and wasn't impressed. Easy to jam etc. So one day I may make my own wired one as a hobby project, just because I'm the kind of person who hangs out on HN and thinks that's cool :)