The Asec ES34 PIR Detector uses a built in infrared sensor to detect movement. Once motion is detected, the unit will switch on your outdoor lights. The internal photocell switches the unit off during the day to save energy. It is an intelligent and versatile unit, featuring adjustable light timer (between 5 seconds and 12 minutes) with automatic and manual control modes and a temperature compensation function for the detection range. The detector may be wall mounted at heights between 1.8 - 2.0 metres, ceiling mounted at 2.5 - 4 metres, and it is weatherproof rated IP44.