The beam operates totally on the theory of sunshine obscuration working with infrared. The OSI-RI detector is actually a combined transmitter/receiver which might be right connected to an smart detector circuit in LiteSpeed® or CLIP mode. I comply with Ampac supplying software updates, product or service updates, gives and promotions https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/