The 39 x 57" IDEA Whiteboard Mount Magnetic Projection Screen/Markerboard Format 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, and its ability to be written on using dry/erase markers or an optional interactive stylus. The screen is designed for ultra short throw projection and has a surface that holds items magnetically. 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 steel clad honeycomb. 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.