Short-Throw Projector Arm Unit for use with select Projectors. Supported Projectors: Panasonic PT-ST10, Sanyo LP-WXL46 (S), Epson EB-410W, Optoma EX525ST, Acer S1200, Benq MP728ST, Benq MP772ST, Benq MP776ST. For use with the Up/Down Wall Mount Unit. Up/Down Wall Mount Unit is sold separately.