A control knob for controlling operation of a machine, the control knob including: an attachment member configured for attaching the control knob to a surface of the machine so that the control knob is operably connectable with the machine to control operation thereof; a display member comprising an electronic display module disposed thereon; an operational mode display controller for controlling display of operational modes of the machine upon the electronic display module, said operational mode display controller being configured for rotational movement around the electronic display module amongst a plurality of rotational positions, said operational mode display controller being operably connected with the electronic display module such that, responsive to the rotational movement of the operational mode display controller amongst the plurality of rotational positions, the electronic display module is configured to display a plurality of operational modes of the machine corresponding to the plurality of rotational positions; and an operational mode selector for controlling selection of one of the plurality of operational modes of the machine when said one of the plurality of operational modes is displayed on the electronic display module, the operational mode selector being configured for movement between at least a first position and a second position to actuate selection of the operational mode displayed on the electronic display module.