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