in fig1 comprises a lower part 102 also referred to as base part and an upper part 104 also referred to as manipulation part detachably assembled together the lower part 102 is provided in order to be fixed rotationally onto a frame of a command input device hereinafter also referred to as u201c game controller u201d at its axis of rotation 106 more particularly the lower part 102 is provided in order to be fixed in the frame of a game controller such that it cannot be mounted detached without partially or fully detaching said frame the command button 100 is rotational in a plane 108 perpendicular to the axis of rotation 106 along a trajectory 110 in the form of an arc of a circle having the axis of rotation 106 as the centre fig2 is a diagrammatic representation of the lower part 102 of the command button in fig1 the lower part 102 comprises a female fixing shape 202 with a cross section in the form of a trapezium or inverted u201c t u201d provided in order to receive in a direction 204 parallel to the axis of rotation 106 and perpendicular to the plane of rotation 108 a male fixing shape provided on the upper part 104 for fixing the upper part 104 together with the lower part 102 in one direction and for removing the upper part 104 from the lower part 102 in the opposite direction this female fixing shape 202 allows for fixing one or more upper parts.