The QTD-402 is an especially slim 21.5” widescreen LED monitor with an innovative housing concept: the back of the “smart panel” has become the cover itself so that a depth of just 0.97 cm could be achieved. The amount of materials used in its construction has been reduced, which facilitates recycling. Underlining the slim mien of the monitor is the selection of materials for the front and back sides as well as the visual contrast between the square-shaped housing and its curved stand.