The usefulness of the system 100 may be greatly extended by switching to the secondary processor when {HEAD ~ battery power} reaches {TAIL ~ a predetermined level} 
reaches
The usefulness of the system 100 may be greatly extended by switching to the secondary processor when { HEAD ~ battery power } reaches { TAIL ~ a predetermined level }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL