I’m not an expert and it’s definitely possible they’re shit, but I remember doing research for buying new smoke detectors and finding out about all the different types of them. Like some don’t even care about smoke, they only care about heat. And others use different methods of detecting smoke that can be better for different types of fires (kitchen grease fire vs electrical fire).

Anyway I had no idea there was more than one type, I feel like that should also be made more obvious when buying new ones.