This isn't the Laredo outdoor motion sensing light, as everyone else was posting about. This is the standard interior motion sensing light on many Keystones in current production, which is (or is similar to) the Dream Lighting 916048CW. It has two ON modes. The one marked "I" is the manual on mode. The one marked "II" is motion sensing, and turns off automatically within a minute or so. I have one of these inside the entry door of my Cougar, and another in the cargo hatch.
Woops, sorry, the actual question was how to remove...
this listing has detailed information about this unit. It looks like you pry out the inner face shield carefully, then there are two screws behind it.