An apparatus comprising a housing part (102,202,302,402) and a control part (104,204,304,404), said control part (104,204,304,404) is substantially rectangular and comprises short sides (205a, 205b, 405a, 405b) and long sides (205c, 205d,305c,405c,405d), said housing part (102,202,302,402) is substantially rectangular with a shorter side next to a long side (205d,405d) of said control part (104,204,304,404), said housing part (102,202,302,402) and said control part (104,204,304,404) are connected with an elastic coupling and configured to be moveable in relation with each other and said housing part (102,202,302,402) comprising a front surface (103,203,303,403) and a back surface and said control part (104,204,304,404) comprising a front surface (105,205,305,405) and a back surface, wherein said front surface (103,203,303,403) of said housing part (102,202,302,402) and said front surface (105,205,305,405) of said control part (104,204,304,404) are configured substantially next to each other in parallel in substantially same plane and form a substantially uniform surface at a stable rest position; and the control part (104,204,304,404) is configured to be steplessly movable in two dimensions in relation with said housing part (102,202,302,402); wherein movement in two dimensions comprises that said front surface (103,203,303,403) of said housing part (102,202,302,402) and said front surface (105,205,305,405) of said control part (104,204,304,404) are configured to move away from each other or towards each other, and that said control part (104,204,304,404) is movable such that one short side (205a, 205b, 405a, 405b) of said control part (104,204,304,404) is upper and other short side (205a, 205b, 405a, 405b) of said control part (104,204,304,404) is lower than the front face level of said housing part (102,202,302,402); and movement of the control part (104,204,304,404) in relation to the housing part (102,202,302,402) is configured to be detected by a detector. said control part (104,204,304,404) is substantially rectangular and comprises short sides (205a, 205b, 405a, 405b) and long sides (205c, 205d,305c,405c,405d), said housing part (102,202,302,402) is substantially rectangular with a shorter side next to a long side (205d,405d) of said control part (104,204,304,404), said housing part (102,202,302,402) and said control part (104,204,304,404) are connected with an elastic coupling and configured to be moveable in relation with each other and said housing part (102,202,302,402) comprising a front surface (103,203,303,403) and a back surface and said control part (104,204,304,404) comprising a front surface (105,205,305,405) and a back surface, wherein said front surface (103,203,303,403) of said housing part (102,202,302,402) and said front surface (105,205,305,405) of said control part (104,204,304,404) are configured substantially next to each other in parallel in substantially same plane and form a substantially uniform surface at a stable rest position; and the control part (104,204,304,404) is configured to be steplessly movable in two dimensions in relation with said housing part (102,202,302,402); wherein movement in two dimensions comprises that said front surface (103,203,303,403) of said housing part (102,202,302,402) and said front surface (105,205,305,405) of said control part (104,204,304,404) are configured to move away from each other or towards each other, and that said control part (104,204,304,404) is movable such that one short side (205a, 205b, 405a, 405b) of said control part (104,204,304,404) is upper and other short side (205a, 205b, 405a, 405b) of said control part (104,204,304,404) is lower than the front face level of said housing part (102,202,302,402); and movement of the control part (104,204,304,404) in relation to the housing part (102,202,302,402) is configured to be detected by a detector.