The present invention includes a knob assembly which provides rotational movement and translational travel along an axis of dual and independent rotary knobs. 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 dual independent push button rotary knob assembly may operate without need for O-rings, gaskets, or any other applied sealants to prevent containments from entering the housing. Assembly of the knob assembly is simplified, because the rotary knob assembly may be installed and replaced without any tools and without need to access the interior of the housing. Furthermore, if any part of the assembly is damaged, the rotary knob assembly, in part or whole, may be replaced without compromising any seal provided to the exterior surfaces of the housing.