... to install and simple maintenance (open pore size:212mmx105mm)3.Auto linkage, one button turn on/off,“system start”and“system ... circuit, effectively avoide coincidence of projection because of long line.13.Preposing computer input VGA,network VGA,USB VGA,220v output ... link with rostrum, when open the door of rostrum, the central control will open automatically, when close the rostrum, closed the ...