On the picture down the right lower arm is in the support-hollow. The staff moves and leans with the movements of the hand. Thus the springs in the armrest become bent and enable the completely gentle movement of the hand over a desk surface.

Thus quasi weightlessly and noiseless all objectes etc. on the desk can be achieved. Laterally along the desk edge is the motion possibility of the hand about a meter; in the direction to the desk the motion possibility is for instance a lower arm length.

Thus the mouse and the keyboard can be used with a lever, without taking off from the armrest. For continuous keyboard work one can use 2 armrests well, in order to relieve both levers.

The attitude of the levers is completely relaxed. Further in addition also on the page "ergonom" .