“It's not easy to write a review of an alarm or smoke sensor as the normal condition is that you don't want it to sound. However the Fibaro smoke sensor is a great little device. Installing it and including it in a Fibaro HC2 based system was straightforward. I placed it on the upstairs landing at the top of the stairs close to an old smoke alarm that I no longer trust to work. The Fibaro one is a fraction of the size of the old one. It is designed to be very discreet. The fact that it like all battery powered devices informs the controller of its battery state is a real comfort. It is almost impossible to ignore a battery warning on the HC2 - especially if set up to send e-mail notifications.”