The HamiltonBuhl manual pull down wall or ceiling mounted projection screen is perfect for classrooms, conference rooms and inexpensive home theater applications. The HamiltonBuhl manual projector screen is a great alternative to an electric projection screen. The manual screen operates just like a standard window shade, revealed by simply pulling the handle down and retracting with the same ease. The screen is height adjustable, using a stop-start feature, that allows the user to lower it to any desired height to accommodate different projection sources and formats.