A control unit includes an electric field sensor and a motion sensor. Signals from the electric field sensor and the motion sensor are interpreted to generate corresponding graphical user interface control signals for a graphical user interface displayed by a separate electronic device. The graphical user interface control signals include movement control signals for a moveable element of the graphical user interface that correspond to movement of the control unit and a select control signal that corresponds to detection of a change in electric field sensed by the electric field sensor that is indicative of a change in a physical configuration of a user's body part.