The present invention includes a push button rotary knob assembly which provides rotational movement and translational travel along an axis. The present invention controls electronics within a housing, without requiring protrusion into the housing. Having no protrusions into the housing avoids exposure of the electronics within the housing to environmental contaminants or electromagnetic interference. The components of the push button rotary knob assembly may operate without need for O-rings, gaskets, or any other applied sealants. Assembly of the push button rotary knob is simplified, because the rotary knob may be assembled and replaced without any tools and without need to access the interior of the housing. Furthermore, if the rotary knob is damaged, the rotary knob may be replaced, and any seal provided to exterior surfaces of the housing is not compromised.