smoke and co detectors

["someone" <someone@xxxxxxxxxxxxxxxx>]

Hi

I hope someone here can help or knows where to look.

Recently I saw some smoke detectors that fitted the majority of their bulk
into the ceiling space so they were much less obvious - does anyone know the
ones I am talking about as I cant find them now.

Any problems with these?

I am also looking for a smoke / co tester for use in the garage - any
comments on good brands or problems with these?

Thanks in advance