1 Packed in case, convenient to carry, and meets the demands of business and home theatre. 2 Air pressure type spring,and scissors type structure,you can adjust it at any position 3 Supporting structure at behind, wonderful design. 4Gain:plastic(1.2),mattewhite(1.1) 5 View angle:plastic(30 degree),mattewhite(55 degree) 6 Size:60*-150*,we can produce according to your demands