1 Unique keystone eliminator system, keeps the screen flat. 2 Lighteeight yet durably constructed, the tripod is designed specifically for audiovisual use. The tripods legs are of sturdy gabled steel. 3 case can be adjusted easily to any level on tripod upright. 4Gain:glassbeaded(2.5),mattewhite(1.1) 5 View angle:glassbeaded(35 degree),mattewhite(55 degree) 6 Size:60*-120*,we can produce according to your demands