The OSI-RE-SS is really a reflector- kind linear optical beam smoke detector made to operate as a ingredient of fireplace alarm programs. The beam operates primarily on the principle of sunshine obscuration utilising an Infra-Purple beam. Shut/span> You cannot accessibility this site as this product isn't offered in the country. https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/