The FST-951R intelligent addressable detector from Honeywell NOTIFIER attributes stage ID functionality that enables Every detector address to become set with rotary address switches to provide exact detector locations. The FSP-951 photoelectric detector’s unique optical sensing chamber is engineered to sense smoke produced by a wide array of combustion resources. https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/