{HEAD ~ The system} 1, wherein {TAIL ~ said detecting means} includes level detector means coupled to said connection terminal means for detecting a power supply from said external device 
wherein
{ HEAD ~ The system } 1 , wherein { TAIL ~ said detecting means } includes level detector means coupled to said connection terminal means for detecting a power supply from said external device
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH