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