The system may also include {HEAD ~ infrared receivers} for receiving infrared command signals from {TAIL ~ an infrared transmitter} 
The system may also include { HEAD ~ infrared receivers } for receiving infrared command signals from { TAIL ~ an infrared transmitter }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL