The method 1, comprising providing {TAIL ~ audible and visual indication} on at least one of the assemblies indicating {HEAD ~ successful exchange} of the pairing information 
The method 1 , comprising providing { TAIL ~ audible and visual indication } on at least one of the assemblies indicating { HEAD ~ successful exchange } of the pairing information
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH