OPERATING DEVICE, VEHICLE AND METHOD FOR OPERATING A VEHICLE

An operating device includes a first operating element with which a user can select one or numerous main functions of a vehicle and that can rotate about an axis of rotation and has at least one predefined fixed rotational position. A second operating element with which a user can adjust subfunctions of the main function can rotate about the axis of rotation and also comprises an actuator unit that comprises a magnetorheological medium configured to exert a retaining force on the second operating element based on a viscosity of the magnetorheological medium. The actuator unit is configured to set the viscosity on the basis of the main function selected with the first operating element, and on the basis of a rotational position of the second operating element.