Abstract: The invention relates to a user input unit comprising a housing configured to be attached to a base of a user input device, such as a keyboard. The input unit also has a first movable element coupled to the housing, the first movable element being movable along a first direction and user operable second movable element coupled to the housing, the second movable element being movable along a second direction, the second direction being different from the first direction. Further a transmission configured to transfer movement of the second movable element along the second direction into movement of the first movable element along the first direction is provided. The invention also relates to a user input device, such as a keyboard, comprising a base, such a user input unit, and a sensor configured to sense a movement or a position of the first movable element along the first direction.