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