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