The OSI-RE-SS is really a reflector- style linear optical beam smoke detector intended to operate for a component of fireplace alarm methods. The beam operates totally on the principle of sunshine obscuration utilising an Infra-Red beam. Close/span> You cannot access this web page as this item isn't obtainable inside your https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/