The beam operates totally on the theory of light obscuration using infrared. The OSI-RI detector is usually a merged transmitter/receiver which can be immediately connected to an clever detector circuit in LiteSpeed® or CLIP method. I agree to Ampac furnishing software package updates, item updates, presents and promotions via e https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/