{HEAD ~ The power switching means} operates irrespective of {TAIL ~ an external supply voltage level} of the power supplied by the host device 
operates irrespective of
{ HEAD ~ The power switching means } operates irrespective of { TAIL ~ an external supply voltage level } of the power supplied by the host device
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH