The FST-951R smart addressable detector from Honeywell NOTIFIER capabilities place ID ability that permits each detector address to become set with rotary address switches to provide exact detector locations. The FSP-951 photoelectric detector’s special optical sensing chamber is engineered to feeling smoke produced by a wide array of combustion resources. https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/