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