The OSI-RE-SS can be a reflector- sort linear optical beam smoke detector made to work for a element of fireplace alarm programs. The beam operates primarily on the basic principle of light obscuration utilising an Infra-Pink beam. Near/span> You can not obtain this page as this item just isn't obtainable https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/