The beam operates totally on the basic principle of sunshine obscuration employing infrared. The OSI-RI detector can be a merged transmitter/receiver which can be right connected to an intelligent detector circuit in LiteSpeed® or CLIP mode. Power and connectivity happen within the imager only as well as the OSID-R only https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/