The present invention relates to an illuminated releasable rotary knob for use in an appliance, in particular in a cooking appliance comprising a panel which includes a regulator shaft; and a control unit which has an electrical connection for supplying electric power. The knob comprises non-transparent handle, a hub for releasably receiving the shaft, a cavity, an illuminating device for illuminating the cavity, a connector for receiving the electrical connection and a transparent indicator which receives the illumination from the cavity.