... system end”could link to Projector,screen,and computer.if set linkage button by the DIP ... 4x1 switcher, audio frequency 2x1switcher6. one line microphone input , Build-in mixing magnify function.7. solidify ... the controller will alarm.10.Funtion of control computer turn on/off, and could set to be ... of projection because of long line.13.Preposing computer input VGA,network VGA,USB VGA,220v output plug ...