i have the analog type of wall stat with a 4"x4" wall electric box I an can find a box cover that fits the control. Most allow for standard single outlets that are too small or dual outlet covers that are too big. This control looks like its inbetween. I checked with numerous suppliers and they do not carry a plate that fits the controller.
Chuck,
If you are referring to the
MICROREG controller, it should have been packaged with a cover to fit a single gang box electrical box.