The Robus R360N-01 Motion Detector works by ensuring lighting only comes on when someone is detected, and most importantly that lighting is switched off when an area is vacated. Also with its passive infra-red and photocell technology, it ensures the lighting comes on only when natural light alone is not enough. Adjustable time delay (5 secs-15 mins) Injection moulded PC housing Sensing zone – 5m radius at 2.8m high Adjustable integral photocell R360 = Max 1000W tungsten or 300W fluorescent Energy Saving Safety class 2 Dimension: Dia: 129mm x D: 29mm