Flex7 FNH Occupancy Sensor Head Master Head offering for straightforward occupancy sensing. Inbuilt infra-red receiver accepts commands from either the Setup or User hand held Remote Controls, whilst an LED provides indication of operation. The PIR (passive infra-red) detector senses movement of warm bodies against a cooler background and sends the information back to the Lighting Control Pack. The detection pattern is broadly rectangular at 7.4m x 5.6m when fixed at a ceiling height of 2.5m (longest length of detection aligning with the spring clips).