The FD705RVDS and FD710RVDS consists of an infrared transmitter and receiver in one single compact housing. The infrared signal is reflected by a prism and analysed for smoke presence. It is particularly designed to be used where point smoke detectors are not applicable due to height or inaccessibility. The unit has C/O relay outputs for alarm and fault and fits as such all types of fire panels. The FD705RVDS has a range of 5-50 m and the FD710RVDS has a range of 50-100 m.