GENERAL CHARACTERISTICS ITEM DESCRIPTION | CONTRAST RATIO 300 TO 1;CEILING/DESK, FRONT/REAR INSTALATION;2W AUDIO;VGGA MONITOR OUTPUT;VGA,SVGA,XGA,SXGA,MAC COMPATABLE;FULL COLOR;MANUAL ZOOM/FOCUS LENS;40IN. BY 300IN. DIAGONAL IMAGE SIZE;20 TO 80 PERCENT OPERATING HUMIDITY |