my office get this rather bulky projector to avoid have to carry around a laptop to show presentation . well ... guess what ?? if you want to show powerpoint or \* . pdf which comprise most business presentation you still have to lug around that laptop in addition to this humongous projector . we be better off with a small projector and laptop . this idiot device will not recognize \* . ppt or \* . pdf file on a dvd , CD , or thumbdrive , so all that supposedly great connectivity be out . if all you want to do be show video and picture get this projector . \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* M.S. \*\*\*\*\*\*\*\*\*\*\*\*\*