{HEAD ~ A top section} of {TAIL ~ the projecting semi cylindrical front} has a front curved window, behind which a passive infrared sensor and an ambient light sensor are positioned 
{ HEAD ~ A top section } of { TAIL ~ the projecting semi cylindrical front } has a front curved window , behind which a passive infrared sensor and an ambient light sensor are positioned
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH