The OSI-RE-SS is actually a reflector- form linear optical beam smoke detector meant to operate being a element of fire alarm systems. The beam operates totally on the theory of light obscuration utilising an Infra-Red beam. Close/span> You can't accessibility this site as this item is just not obtainable as https://bookmarkfame.com/story18425479/the-5-second-trick-for-conventional-beam-detectors