The system 1, wherein {TAIL ~ the transmitter} is inoperable to transmit data when {HEAD ~ the actual voltage supply level} of the batter is lower than the second voltage threshold 
The system 1 , wherein { TAIL ~ the transmitter } is inoperable to transmit data when { HEAD ~ the actual voltage supply level } of the batter is lower than the second voltage threshold
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH