I still was surprised by the lack of instructions included with this fixture, but with some expereince, it will be easily spell. What also surprised me is that it is completely plastic. I guess that's not having corrosion problems. Still, it is a quality plastic, it makes very good and very well illuminated. It is fixed with 3 fixing points, there is no ground connection, I put it above my garage door, and it works beautifully. Motion detection is sufficiently sensitive to detect any presence. The device also has, in the lower part of its support for a potentiomère adjust the illumination duration, intensity, and if it is active during the day or night. I'm very happy.