The beam operates primarily on the theory of sunshine obscuration using infrared. The OSI-RI detector can be a combined transmitter/receiver which can be specifically connected to an smart detector circuit in LiteSpeed® or CLIP method. Power and connectivity take place during the imager only and also the OSID-R only needs https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/