High-low case adjustment allows a 40" x 40" screen to be fully opened in a room with an 8' ceiling. Keystone eliminator tilts the screen forward to compensate for distorted images. Matte White is the most versatile screen surface & the premier choice when ambient light is controllable. It evenly distributes light over a wide viewing area while colors remain bright & life-like, with no shifts in hue. Screen surface can be cleaned with mild soap & water. Flame retardant & mildew resistant.