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