A trackball module is provided for connecting a trackball to an electrical device, comprising a trackball for being manipulated by hand, a sensor device for detecting a turning of the trackball, a support device for positioning the trackball in a use position, in which the trackball is exposed for being manipulated, and a rest position, in which the trackball is adapted for being received by the electrical device, and an operating direction, which is defined roughly by a line through the center of the trackball and the center of a manipulating surface of the trackball exposed for turning the trackball by hand in the use position.