[Daftasabrush]

Originally Posted by Brigand

Far simpler to approve one alarm system, than multiple types.

Also makes BOM simpler for manufacturing.

I understand it will make it cheaper, but from a technology point of view, which input do you trust? Or do you design it so the microwave is used to verify a trigger by the ultrasonics, in which case, why bother with the ultrasonics at all if you're using the microwave sensor? Would love to know how it's implemented.