What is the Difference Between MOBITEK Q24 STK MODEM HUB Model STKMH-US401-C and STKMH-EP432-C Model: STKMH-US401-C — connectivity is USB Model: STKMH-EP432-C — connectivity is ethernet/LAN Model: STKMH-US401-C — connectivity is USB Model: STKMH-EP432-C — connectivity is ethernet/LAN