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