Aurem Sound Proofing Stand Reflector Board for French Horn This is a portable reflector board designed to project the sound of a French horn forward. It can be used in rooms without a reflector board or when playing outdoors. The angle and height of the board can be adjusted freely. Used about twice. The photos were taken in two different locations. Only one unit is included. (The photos were taken in different locations to make it easier to see, as the acrylic board reflects light.)