The beam operates primarily on the theory of light obscuration employing infrared. The OSI-RI detector is really a merged transmitter/receiver that may be specifically connected to an smart detector circuit in LiteSpeed® or CLIP manner. I agree to Ampac offering program updates, item updates, delivers and promotions by using email https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/