Key and button arrangement for a portable, foldable electronic device comprising at least two use positions

A portable, foldable electronic device comprising an opened use position and a closed use position, and a handle arrangement for the same. It comprises at least a first housing part, a second housing part, a hinge mechanism arranged for folding the housing parts, an electronic display fitted on at least one inner wall of the housing part, a handle-like third housing part arranged for holding the device in the use positions and comprising a wall to be placed transversely against the user's palm, wherein the hinge mechanism is arranged on the side of the opposite wall and arranged for folding the first and the second housing parts in relation to the third housing part, wherein each adjacent wall is provided with at least one key button within reach of the fingers, and wherein the first wall, the upper wall or the edge therebetween is provided with a navigation key within reach of the forefinger, equipped with a push-button function and arranged rotatable in at least two opposite directions.