The beam operates primarily on the theory of sunshine obscuration making use of infrared. The OSI-RI detector is a blended transmitter/receiver that can be right connected to an smart detector circuit in LiteSpeed® or CLIP manner. I agree to Ampac offering program updates, solution updates, presents and promotions by using https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/