This Swivel Mount Photocell is designed to fit into low voltage lighting transformers, standard outlet boxes, post lamps, or wall packs. It allows for turning and adjusting of its position relative to the sun rays. It also includes a sliding shield for adjustment of light sensitivity. For best results, position the photo control so it faces the north. If installed on the south side of a building, point the photo control to the east or west or towards the ground.