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