The beam operates primarily on the basic principle of sunshine obscuration working with infrared. The OSI-RI detector is a put together transmitter/receiver which can be straight linked to an smart detector circuit in LiteSpeed® or CLIP mode. Power and connectivity arise within the imager only as well as OSID-R only https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/