The motion sensor 1, wherein {HEAD ~ a position} of {TAIL ~ the adjusting bar} is adjustable 
of
The motion sensor 1 , wherein { HEAD ~ a position } of { TAIL ~ the adjusting bar } is adjustable
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH