The Flasher Woodpecker/Bird Deterrent is wind operated and it is best hung from the outside corner of buildings. At this location it can receive wind from 270 degress, as well as increasing visibility to the woodpecker. If trees are present at these locations, move the flasher to a point that receives not only wind but is visible from the area that is receiving woodpecker damage. It is usually not necessary to put it directly at the point of activity, however try to keep it within 20 feet of the damage area. Comes complete with a wire arm for mounting with a drywall screw to the side of the structure.