Optical Smoke Detectors detect smoke particles typically generated by fire and are faster than normal standard ionisation smoke detectors. It is recommended by the Fire Service to have at least two in a two-storey dwelling, one on the landing and the other at the bottom of the stairs in the hallway. We would also recommend areas such a study, garage and workshop for additional smoke detection. This unit is also connected to a monitoring station, who can take appropriate action in the event of an activation, invaluable when the premises are empty.