The 45 x 69" IDEA Whiteboard Mount Projection Screen/Markerboard from Da-Lite combines the benefits of a traditional projection screen and markerboard with its 2.5 Gain rating and 50° viewing angle (25°, L/R), GREENGUARD certification, plus its ability to be written on using dry/erase markers, or an optional interactive stylus. The screen is designed for ultra short throw projection. The IDEA is mounted to the wall above your chalkboard using the included two vertical brackets and WBM2 Micro-Adjustable Wall Mount that is height and lateral adjustable in 1" increments.
The benefit of the IDEA is that it saves you the expense of buying a separate projection screen and whiteboard since the projection surface is permanently bonded to a tempered hardboard. The screen has a rigid extruded aluminum silver frame with a bottom tray to hold the included black, red, green and blue markers, eraser and screen cleaner.