The 20985 is designed by Da-Lite to keep a room with clean lines, the Tensioned Conference Electrol¨ allows the screen and video conferencing camera to be concealed in the ceiling when not in use. The ceiling recessed screen is designed to elimi…nate the extra step of finishing the screen with trim. Once the screen is installed, the screenÕs trim conceals the rough opening eliminating the need to complete additional trim work.Product Features:Tensioned Conference Electrol Projection Screen 137 DM w/ 220V MotorIntegrated video conferencing camera shelfSlim-Tab, a lower profile and stronger tab design to keep your screen perfectly taut