In {TAIL ~ some embodiments} audible and visual indication can be provided on the assemblies indicating successful exchange of {HEAD ~ the pairing information} 
In { TAIL ~ some embodiments } audible and visual indication can be provided on the assemblies indicating successful exchange of { HEAD ~ the pairing information }
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD