The Dalite 78 x 139" Model C Manual Front Projection Screen is a perfect choice for either a large lecture or seminar hall, or conference/training room. The screen is designed for heavy use and features lubricated steel ball bearings for a smooth operating system. The screen is accessed via a pull cord. The CSR mechanism was designed to provide a smooth and safe way for the screen to be retracted into its case. This kind of consistent operation ensures a longer life for the screen. Screens with CSR must be fully extended since there are no intermediate stopping positions. As an option, you can purchase the screen in any one of seven veneer finishes to give it a more professional, finished appearance. If you prefer not to choose a veneer or laminate, the screen will come with a white casing. In addition, you can also purchase floating brackets which allow the screen to be either wall or ceiling mounted but which also give you the freedom to align the system left/right.