The FST-951R intelligent addressable detector from Honeywell NOTIFIER options position ID ability that enables each detector handle to get set with rotary address switches to offer actual detector locations. The FSP-951 photoelectric detector’s distinctive optical sensing chamber is engineered to sense smoke produced by a wide range of combustion sources. https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/