whAt is thE spECiAl FEAturE oFEFFnEt’s FirEwAll systEmA、All thE DEviCEs AnD pArts ArE put in thE BAsEmEnt.B、All thE DEviCEs AnD pArts ArE put into A singlE Box.C、CEllulAr phonE AnD intErnEt ArE pArt oF this systEm.