The temperature sensor and the passive infrared sensor are mounted on a front electrical lead side of a vertically positioned PC board, and heat generating {HEAD ~ electrical components} are mounted on {TAIL ~ an opposite, back component side} of the PC board 
are mounted on
The temperature sensor and the passive infrared sensor are mounted on a front electrical lead side of a vertically positioned PC board , and heat generating { HEAD ~ electrical components } are mounted on { TAIL ~ an opposite , back component side } of the PC board
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH