The beam operates totally on the principle of light obscuration applying infrared. The OSI-RI detector is actually a merged transmitter/receiver that can be specifically connected to an smart detector circuit in LiteSpeed® or CLIP manner. Energy and connectivity come about within the imager only plus the OSID-R only requires a https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/