Protect projectors from theft! The PL-1 series provides an added measure of defense from theft beyond Chief's standard All-Points Security without the extreme of enclosing the entire projector. This new approach to projector security includes 3 unique key options for multiple installations at the same location, and is compatible with all new and existing Chief RPA series installations. PL-1 excludes the projector mounting system (RPAU recommended). Also required is the mounting hardware based on your type of installation (ceiling plate and pipe length).